What are the physical and chemical properties of 2-Hydroxyethanesulfonic acid - 6-acetyl-8-cyclopentyl-5-methyl-2-{[5-(1-piperazinyl)-2-pyridinyl]amino}pyrido[2,3-d]pyrimidin-7(8H)-one (CAS: 827022-33-3)?

2-Hydroxyethanesulfonic acid - 6-acetyl-8-cyclopentyl-5-methyl-2-{[5-(1-piperazinyl)-2-pyridinyl]amino}pyrido[2,3-d]pyrimidin-7(8H)-one is a crystalline compound with a molecular weight of approximately 522.7 g/mol. It has a solubility of around 1.3 g/L in water. The compound exhibits moderate reactivity, particularly towards nucleophiles, and is stable under neutral to mildly acidic conditions. It is not flammable and has a low risk of reactivity with common laboratory reagents.