SPL Set ID: b09abf73-1eef-4e12-b400-c030d546d223

Lapatinib is a small molecule and a member of the 4-anilinoquinazoline class of kinase inhibitors. It is present as the monohydrate of the ditosylate salt, with chemical name N -(3-chloro-4-{[(3- fluorophenyl)methyl]oxy}phenyl)-6-[5-({[2-(methylsulfonyl)ethyl]amino}methyl)-2-furanyl]-4- quinazolinamine bis(4-methylbenzenesulfonate) monohydrate. It has the molecular formula C 29 H 26 ClFN 4 O 4 S (C 7 H 8 O 3 S) 2 H 2 O and a molecular weight of 943.5 g/mol. Lapatinib ditosylate monohydrate has the following chemical structure: Lapatinib is a yellow solid, and its solubility in water is 0.007 mg/mL and in 0.1N HCl is 0.001 mg/mL at 25°C. Each 250 mg tablet of lapatinib contains 405 mg of lapatinib ditosylate monohydrate, equivalent to 398 mg of lapatinib ditosylate or 250 mg lapatinib free base. The inactive ingredients of lapatinib tablets are as follows: iron oxide yellow, magnesium stearate, microcrystalline cellulose, polyethylene glycol 3350, polyvinyl alcohol (part hydrolyzed), povidone, sodium starch glycolate Type A, talc, and titanium dioxide. chemical structure