1. 2.3.2.4 enzyme   L-glutamic cyclase
                      gamma-glutamylcyclotransferase
                      gamma-L-glutamylcyclotransferase
                      gamma-glutamyl-amino acid cyclotransferase
                      (5-L-glutamyl)-L-amino-acid 5-glutamyltransferase (cyclizing)

2. 2.3.2.5 enzyme   glutaminyl cyclase
                      glutaminyl-peptide cyclotransferase
                      glutaminyl-tRNA cyclotransferase
                      glutaminyl-transfer ribonucleate cyclotransferase
                      L-glutaminyl-peptide gamma-glutamyltransferase (cyclizing)

3. 2.7.8.21 enzyme   phosphoglycerol cyclase
                      periplasmic phosphoglycerotransferase
                      membrane-oligosaccharide glycerophosphotransferase
                      membrane-derived-oligosaccharide-6-(glycerophospho)-D- glucose:membrane-derived-oligosaccharide-D-glucose glycerophosphotransferase

4. 4.2.1.48 enzyme   D-glutamate cyclase
                      D-glutamate hydro-lyase (cyclizing)

5. 4.2.3.21 enzyme   vetispiradiene cyclase
                      vetispiradiene-forming farnesyl pyrophosphate cyclase
                      HVS
                      pemnaspirodiene synthase
                      vetispiradiene synthase
                      trans,trans-farnesyl-diphosphate diphosphate-lyase (cyclizing, vetispiradiene-forming)

6. 4.2.3.6 enzyme   sesquiterpene cyclase
                      trichodiene synthase
                      trichodiene synthetase
                      trans,trans-farnesyl-diphosphate sesquiterpenoid-lyase
                      trans,trans-farnesyl-diphosphate diphosphate-lyase (cyclizing, trichodiene-forming)

7. 4.2.3.9 enzyme   sesquiterpene cyclase
                      aristolochene synthase
                      trans,trans-farnesyl diphosphate aristolochene-lyase
                      trans,trans-farnesyl-diphosphate diphosphate-lyase (cyclizing, aristolochene-forming)

8. 4.3.1.12 enzyme   ornithine cyclase
                      ornithine cyclase (deaminating)
                      ornithine cyclodeaminase
                      L-ornithine ammonia-lyase (cyclizing)

9. 4.6.1.1 enzyme   adenylylcyclase
                      adenyl cyclase
                      adenylate cyclase
                      ATP diphosphate-lyase (cyclizing)
                      3',5'-cyclic AMP synthetase

10. 4.6.1.15 enzyme   FMN cyclase
                      FAD-AMP lyase (cyclizing)
                      FAD AMP-lyase (cyclic-FMN-forming)

11. 4.6.1.2 enzyme   guanyl cyclase
                      guanylate cyclase
                      guanylyl cyclase
                      GTP diphosphate-lyase (cyclizing)

12. 4.6.1.6 enzyme   cytidyl cyclase
                      cytidylate cyclase
                      cytidylyl cyclase
                      CTP diphosphate-lyase (cyclizing)
                      3',5'-cyclic-CMP synthase

13. 5.4.99.7 enzyme   oxidosqualene cyclase
                      oxidosqualene-lanosterol cyclase
                      squalene epoxidase-cyclase
                      2,3-oxidosqualene cyclase
                      2,3-epoxysqualene lanosterol cyclase
                      2,3-oxidosqualene sterol cyclase
                      2,3-oxidosqualene-lanosterol cyclase
                      lanosterol 2,3-oxidosqualene cyclase
                      squalene 2,3-epoxide:lanosterol cyclase
                      squalene-2,3-oxide-lanosterol cyclase
                      lanosterol synthase
                      (S)-2,3-epoxysqualene mutase (cyclizing, lanosterol-forming)

14. 5.5.1.5 enzyme   3-carboxymuconate cyclase
                      carboxy-cis,cis-muconate cyclase
                      3-carboxy-2,5-dihydro-5-oxofuran-2-acetate lyase (decyclizing)

15. 5.5.1.8 enzyme   (+)-bornylpyrophosphate cyclase
                      geranyl-diphosphate cyclase
                      bornyl diphosphate synthase
                      bornyl pyrophosphate synthase
                      bornyl pyrophosphate synthetase
                      (+)-bornyl-diphosphate lyase (decyclizing)

16. 6.5.1.4 enzyme   RNA cyclase
                      RNA-3'-phosphate cyclase
                      RNA-3'-phosphate:RNA ligase (cyclizing, AMP-forming)

17. 1.14.13.85 enzyme   dimethylallyl-3,6a,9-trihydroxypterocarpan cyclase
                      glyceollin synthase
                      2-(or 4-)dimethylallyl-(6aS,11aS)-3,6a,9- trihydroxypterocarpan,NADPH:oxygen oxidoreductase (cyclizing)

18. 1.14.99.7 enzyme   squalene oxydocyclase
                      squalene 2,3-oxidocyclase
                      squalene-2,3-epoxide cyclase
                      squalene epoxidase
                      squalene hydroxylase
                      squalene monooxygenase
                      squalene-2,3-epoxidase
                      squalene,hydrogen-donor:oxygen oxidoreductase (2,3-epoxidizing)

19. 4.2.3.10 enzyme   (-)-endo-fenchol cyclase
                      geranyl pyrophosphate:(-)-endo-fenchol cyclase
                      (-)-endo-fenchol synthase
                      geranyl-diphosphate diphosphate-lyase [cyclizing, (-)-endo-fenchol-forming]

20. 4.2.3.11 enzyme   sabinene hydrate cyclase
                      sabinene-hydrate synthase
                      geranyl-diphosphate diphosphate-lyase (cyclizing, sabinene-hydrate-forming)

21. 5.3.99.6 enzyme   allene-oxide cyclase
                      (9Z)-(13S)-12,13-epoxyoctadeca-9,11,15-trienoate isomerase (cyclizing)

22. 5.4.99.17 enzyme   squalene-hopene cyclase
                      squalene mutase (cyclizing)

23. 5.4.99.8 enzyme   2,3-epoxysqualene cycloartenol-cyclase
                      2,3-epoxysqualene-cycloartenol cyclase
                      2,3-oxidosqualene-cycloartenol cyclase
                      squalene-2,3-epoxide-cycloartenol cyclase
                      cycloartenol synthase
                      (S)-2,3-epoxysqualene mutase (cyclizing, cycloartenol-forming)

24. 5.5.1.4 enzyme   glucose 6-phosphate cyclase
                      glucocycloaldolase
                      inositol 1-phosphate synthatase
                      inositol 1-phosphate synthetase
                      inositol-3-phosphate synthase
                      D-glucose 6-phosphate cycloaldolase
                      myo-inositol-1-phosphate synthase
                      glucose-6-phosphate inositol monophosphate cycloaldolase
                      1L-myo-inositol-1-phosphate lyase (isomerizing)

25. 4.3.2.4 enzyme   purine imidazole-ring cyclase
                      DNA-4,6-diamino-5-formamidopyrimidine C8-N9-lyase (cyclizing)

26. 1.14.13.81 enzyme   Mg-protoporphyrin IX monomethyl ester (oxidative) cyclase
                      magnesium-protoporphyrin IX monomethyl ester (oxidative) cyclase
                      magnesium-protoporphyrin-IX 13-monomethyl ester,NADPH:oxygen oxidoreductase (hydroxylating)