5H-3,5a-Ethano-7aH-indeno[5,4-c]oxepin-7a-carboxylicacid, 3,6,7,8,9,10,10a,10b-octahydro-3-methyl-8-(1-methylethyl)-, [3S-(3a,5aa,7ab,8b,10aa,10bb)]-