3,8,12,18-tetra-(2-methoxycarbonylethyl)-7,13,17-trismethoxycarbonylmethyl-6'-oxo-1',2',5',6'-tetrahydropyrido<3',4'-m>bilane

1,10-dihydro-3,7-bis(methoxycarbonylethyl)-2,8-bis(methoxycarbonylmethyl)-1-oxodipyrrin-9-carbaldehyde

1-methoxy-3,7-bis(2-methoxycarbonylethyl)-2,8-bis(methoxycarbonylmethyl)dipyrrin-9-carbaldehyde