IPA-3 25MG. IPA-3, A PAK1 inhibitor, CAS Number: 42521-82-4, Molecular Formula: C20H14O2S2, Molecular Weight: 350. 45, Purity: greater than or equal to 95%, Appearance: Yellow solid, Storage: Conditions -20 deg C, Synonym: 1, G1'-Gdithiobis-G2-Gnaphthalenol, Size: 25MG