2-Butene-1,4-diol,2-[2-[2,3,4,4a,5,8,9,9a-octahydro-4a-hydroxy-6-(hydroxymethyl)-1,2-dimethyl-1H-benzocyclohepten-1-yl]ethyl]-,[1S-[1a(Z),2b,4ab,9aa]]-