ramosetron [ 5-((1-methyl-3-indolyl)carbonyl)-4,5,6,7-tetrahydro-1H-benzimidazol,YM 060,Methanone, (1-methyl-1H-indol-3-yl)(4,5,6,7-tetrahydro-1H-benzimidazol-5-yl)-, monohydrochloride, (R)-,Nasea,YM-060,YM060,ramosetron hydrochloride ] structure given in first source