Butanamide, N-((7-cyano-1,5,6,7,9,10,13,14,14a,15-decahydro-2,11-dimethoxy-3,12,16-trimethyl-1,4,10,13-tetraoxo-6,15-imino-4H-isoquino(3,2-b)(3)benzazocin-9-yl)methyl)-2-oxo-, (6R-(6alpha,7beta,9alpha,14abeta,15alpha))-