7H-Pyrazolo[4,3-d]pyrimidin-7-one,5-[2-ethoxy-5-[(4-ethyl-1-piperazinyl)acetyl]phenyl]-1,4-dihydro-1-methyl-3-propyl-(9CI);Hongdenafil;5-[2-ethoxy-5-[2-(4-ethylpiperazin-1-yl)acetyl]phenyl]-1-methyl-3-propyl-6H-pyrazolo[4,3-d]pyrimidin-7-one;
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