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Hydroxyhongdenafil Hydroxyacetildenafil Hydroxyhongdenafil-d4 Acetildenafil Impurity 1 Hydroxy Acetildenafil Solution, 100ppm 5-[2-ethoxy-5-[2-[4-(2-hydroxyethyl)piperazin-1-yl]acetyl]phenyl]-1-methyl-3-propyl-4H-pyrazolo[4,3-d]pyrimidin-7-one 5-[2-Ethoxy-5-[2-[4-(2-hydroxyethyl)-1-piperazinyl]acetyl]phenyl]-1,6-dihydro-1-Methyl-3-propyl-7H-pyrazolo[4,3-d]pyriMidin-7-one 7H-Pyrazolo[4,3-d]pyrimidin-7-one, 5-[2-ethoxy-5-[2-[4-(2-hydroxyethyl)-1-piperazinyl]acetyl]phenyl]-1,6-dihydro-1-methyl-3-propyl-