morantel morantel morantel is an anthelmintic drug used for the removal of parasitic worms in livestock. it affects the nervous system of worms given the drug is an inhibitor of acetylcholinesterase. it is derived in part from 3-methylthiophene. morantel is closely related to pyrantel. morantel names preferred iupac name 1-methyl-2--1,4,5,6-tetrahydropyrimidine other names morantel tartrate; paratect identifiers cas number 20574-50-9 3d model (jsmol) interactive image echa infocard 100.039.885 pubchem cid 5353792 unii 7nj031hax5 comptox dashboard (epa) dtxsid9048562 smiles cc1=c(sc=c1)c=cc2=ncccn2c properties chemical formula c12h16n2s molar mass 220.33 g·mol−1 except where otherwise noted, data are given for materials in their standard state (at 25 °c , 100 kpa). infobox references