benzimidazole
noun(benz-imid-azole)
a crystalline base C7H6N2 that is composed of a benzene ring fused with an imidazole ring and is structurally similar to purine; also : any of various derivatives (such as thiabendazole, omeprazole, or benomyl) of this base typically possessing therapeutic properties including broad-spectrum anthelmintic, fungicidal, or antimicrobial action