The present invention relates to a class of 2-aminothiazoline derivatives of formula I: in which either R1 is a hydrogen atom or an alkyl radical and R2 is an alkyl, -alk-NH2, —CH2—R3, —CH2—S—R4 or phenyl radical substituted with a nitro or —NH—C(═NH)CH3 radical, or R1 is an alkyl radical and R2 is a hydrogen atom, R3 is a (3-6C) cycloalkyl, pyridyl, pyridyl N-oxide, thienyl, thiazolyl, imidazolyl, pyrazinyl, triazolyl or phenyl radical or a phenyl radical substituted with a nitro, hydroxy or carboxyl radical, R4 represents a pyridyl or pyridyl N-oxide radical, alk represents an alkylene radical, or pharmaceutically acceptable salts thereof, which are useful as inhibitors of inducible NO-synthase.