111555-57-8 4,8-Methanobenzofuro(2,3-a)pyrido(4,3-b)carbazole-1,8a(9H)-diol, 7-(cyclopropylmethyl)-5,6,7,8,14,14b-hexahydro-14-methyl-, (8R-(4bS*,8alpha,8abeta,14bbeta))- N-METHYL-NALTRINDOLE, C-11 N-Methylnaltrindole