Clonidine hydrochloride 100MG. Clonidine hydrochloride, CAS: 4205-91-8, Molecular Formula: C9H9Cl2N3.HCl, Molecular Weight: 266. 55, Purity: greater than or equal to 98%, Appearance: White to off-white solid, Synonym: 2-(2, 6-Dichloroanilino)-2-imidazoline hydrochloride, Size: 100MG