6a′-Isopropyl-8b′-methyl-3b′,4′,4a′,7a′,7b′,8b′,9′,10′-octahydro-6a′H-spiro[oxirane-2,6′-trisoxireno[6,7:8a,9:4b,5]phenanthro[1,2-c]furan]-1′(3′H)-one

6a′-Isopropyl-8b′-methyl-3b′,4′,4a′,7a′,7b′,8b′,9′,10′-octahydro-6a′H-spiro[oxirane-2,6′-trisoxireno[6,7:8a,9:4b,5]phenanthro[1,2-c]furan]-1′(3′H)-one

Spiro[oxirane-2,6′(6′aH)-trisoxireno[6,7:8a,9:4b,5]phenanthro[1,2-c]furan]-1′(3′H)-one, 3′b,4′,4′a,7′a,7′b,8′b,9′,10′-octahydro-8′b-methyl-6′a-(1-methylethyl)-

(14S)-Triptolide-14-spiro-1′-oxirane