135257-45-3 Crambescidin 816 Dispiro(oxepin-2(3H),4'-(4H-5,6,8b)triazaacenaphthylene-7'(5'H),2''-(2H)pyran)-8'-carboxylic acid, 7-ethyl-1',2',2'a,3',3'',4,4'',5'',6'',7,8',8'a-dodecahydro-8'a-hydroxy-6''-methyl-, 16-((4-amino-2-hydroxybutyl)(3-aminopropyl)amino)-16-oxohexadecyl ester, (2'aS-(2'aalpha,4'alpha(R*),7'alpha(S*),8'beta(R*),8'aalpha))-