5-(2-ethoxyphenyl)-1-methyl-3-propyl-1,6-dihydro-7H-pyrazolo[4,3-d]pyrimidin-7-one

5-(2-乙氧苯基)-1-甲基-3-丙基-1,6-二氢-7H-吡唑并[4,3-d]嘧啶-7-酮

Also known as: Sildenafil lactam impurity, UK-088800, 5-(2-ethoxyphenyl)-1-methyl-3-n-propyl-1,6-dihydro-7H-pyrazolo[4,3-d]pyrimidin-7-one, 7H-pyrazolo[4,3-d]pyrimidin-7-one, 5-(2-ethoxyphenyl)-1,6-dihydro-1-methyl-3-propyl-, 5-(2-ethoxyphenyl)-1-methyl-3-propyl-1H-pyrazolo[4,3-d]pyrimidin-7(6H)-one, 5-(2-ethoxyphenyl)-1-methyl-3-propyl-4H-pyrazolo[4,3-d]pyrimidin-7-one

5-(2-ethoxyphenyl)-1-methyl-3-propyl-1,6-dihydro-7H-pyrazolo[4,3-d]pyrimidin-7-one (CAS 139756-21-1) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C17H20N4O2 and a molecular weight of 312.366 g/mol. It is also known as Sildenafil lactam impurity, UK-088800 and 5-(2-ethoxyphenyl)-1-methyl-3-n-propyl-1,6-dihydro-7H-pyrazolo[4,3-d]pyrimidin-7-one. Key properties include a melting point of 141-145ºC(lit.), a boiling point of 504ºC at 760 mmHg, a density of 1.3±0.1 g/cm3 and a flash point of 258.6ºC. GHS signal word: Warning. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.

139756-21-1

Jingsj CID

J-1971442-8

Molecular Formula

C₁₇H₂₀N₄O₂

Chinese Name

5-(2-乙氧苯基)-1-甲基-3-丙基-1,6-二氢-7H-吡唑并[4,3-d]嘧啶-7-酮

Molecular Weight

312.366 g/mol

Category

Pharma Intermediates

Last updated

8/21/2026