[(3s,5r,10s,13r,14r,17r)-4,4,10,13,14-pentamethyl-17-[(2r)-6-methylhept-5-en-2-yl]-2,3,5,6,7,11,12,15,16,17-decahydro-1h-cyclopenta[a]phenanthren-3-yl] Octadecanoate