6,22-Imino-13,18a-methano-18aH-indolo[3'''',- 2'''':5''',6''']cycloocta[1''',2''':4'',5'']pyrano[3'',2'':- 5',6']pyrano[3',2':5,6]indolo[3,2-a]quinolizine- 25-carboxylic acid,14-ethylidene-5,6,6a,7,8a,- 11b,12,13,14,15,17,18,20,20a,20b,21,22,23- octadecah