The 1- and dl-(racemic) forms of the compounds of the formula ...(I), wherein R is H or CH3, and the non-toxic acid addition salts thereof, useful as anthelmintic compounds are disclosed. The compounds may be prepared by reacting 1- or dl6-(m-aminophenyl)-2,3,5,6-tetrahydroimidazo¢2,1-b!thiazole with an acid of the formula ...(III), wherein R is H or CH3, or with its functional equivalent as an acylating agent, and if desired, when the dl- form of the thiazole starting material is used, resolving the dl- product so as to obtain the 1- form, and if desired, converting an 1- or dl- form of a compound of the Formula (I), into a non-toxic addition salt by reaction with a suitable acid.
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