(4aS)-1,2,3,4,4a,7,7aα,8,9,10,11,11aα,12,13,13aβ,13bα-Hexadecahydro-7-hydroxy-10β-methyl-7α,13α-methano-5H-naphtho[2,1:4,5]cyclohepta[1,2-b]pyridin-5-one