ethyl 2-ethyl-3-oxobutanoate
methyl 6-aminonicotinoate
3-ethoxy-2-methoxy-benzaldehyde
3-ethyl-2-methyl-4-oxo-4H-pyrido<1,2-a>pyrimidine-7-carboxylic acid methyl ester
5-[(E)-2-(3-Ethoxy-2-methoxy-phenyl)-vinyl]-6-ethyl-7-oxo-1,7b-dihydro-7H-4,7a-diaza-cyclopropa[a]naphthalene-1a-carboxylic acid methyl ester
5-[(E)-2-(3-Ethoxy-2-methoxy-phenyl)-vinyl]-6-ethyl-7-oxo-1,7b-dihydro-7H-4,7a-diaza-cyclopropa[a]naphthalene-1a-carboxylic acid
2-[(E)-2-(3-Ethoxy-2-methoxy-phenyl)-vinyl]-3-ethyl-4-oxo-4H-pyrido[1,2-a]pyrimidine-7-carboxylic acid methyl ester