N-methylnaltrindole

(4bS,8R)-7-(Cyclopropylmethyl)-14-methyl-4,8α-methano-5,6,7,8,8a,9,14,14bβ-octahydrobenzofuro[2,3-a]pyrido[4,3-b]carbazole-1,8aβ-diol

(5aS,11bR,12cS)-15-Cyclopropylmethyl-4,5,5a,6,11,11bβ-hexahydro-11-methyl-5β,12c-(iminoethano)-12cH-benz[3,4]isobenzofuro[1,7-ab]carbazole-1,5aβ-diol