ID 5.4.99.32 DE protostadienol synthase. CA (S)-2,3-epoxysqualene = (17Z)-protosta-17(20),24-dien-3beta-ol. CC -!- (17Z)-protosta-17(20),24-dien-3beta-ol is a precursor of the CC steroidal antibiotic helvolic acid. DR Q4WR16, HELA_ASPFU ; E4V6I8, PDSA_ARTGP ; B0Y5B4, PDSA_ASPFC ; DR A1CVK0, PDSA_NEOFI ; //