1-morpholino-7-phenylpyrido[3,4-d]pyridazin-4(2H)-one

4-morpholino-7-phentlpyrido[3,4-d]pyridazin-1(2H)-one

7-(3-hydroxyphenyl)-1,4-dimorpholino-7-phenylpyrido[3,4-d]pyridazine

7-(4-hydroxy-3-methoxyphenyl)-1,4-dimorpholino-7-phenylpyrido[3,4-d]pyridazine

4-[N-carboxymethyl-N-(2-hydroxyethyl)amino]-1-morpholino-7-phenylpyrido[3,4-d]pyridazine sodium salt