3-benzoyl-1,2,5,6,7,8-hexahydroazonino[5,4-b]indol-4-one

3-(6-oxo-8,9-dihydro-7H-pyrido[1,2-a]indol-10-yl)propanoic acid

methyl 5,10-dioxodeca-6,8-dienoate

methyl 5,10-dihydroxy-10-methoxydeca-6,8-dienoate

methyl 5-hydroxy-10-oxodeca-6,8-dienoate