1H-pyrido[3,4-b]indole, 2,3,4,9-tetrahydro-7-methoxy-1,2-dimethyl- 8'-ethyl-5-methoxy-2',3',4a',5',6',7',8',8a'-octahydrospiro[indole-2,4'-[1,6]methanoquinolin]-3(1H)-one InChI=1/C20H26N2O2/c1-3-13-8-12-9-16-18(13)22(11-12)7-6-20(16)19(23)15-10-14(24-2)4-5-17(15)21-20/h4-5,10,12-13,16,18,21H,3,6-9,11H2,1-2H