part of Decarboxylation Steroid biosynthesis ATP + (R)-5-Diphosphomevalonate => ADP + Isopentenyl diphosphate + Orthophosphate + CO2( EC:4.1.1.33 ) ATP + (R)-Mevalonic acid 5-diphosphate => ADP + Isopentenyl diphosphate + Orthophosphate + CO2( EC:4.1.1.33 ) EC:4.1.1.33 IEV:0003043 IMR:0001351 IMR:0001360 IMR:0200102 IMR:0200287 IMR:0200324 IMR:0200431 KEGG:R01121 KEGG:map00900 event