WHI-P154 25MG. WHI-P154, A potent JAK3 inhibitor, CAS: 211555-04-3, Molecular Formula: C16H14BrN3O3, Molecular Weight: 376. 2, Purity: greater than or equal to 98%, Appearance: White to off-white solid, Synonym: 2-Bromo-4-[(6, 7-dimethoxy-4-quinazolinyl)amino]phenol, Size: 25MG