AZILECT® tablets contain rasagiline (as the mesylate), a propargylamine-based d rug indicated for the treatment of idiopathic Parkinson's disease. It is designated chemically as: 1H-Inden-1-amine, 2, 3dihydro-N-2-propynyl-, (1R)-, methanesulfonate. The empirical formula of rasagiline mesylate is (C12H13N)CH4SO3 and its molecular weight is 267.34. Its structural formula is: