the s molecular structure of ethyl nicotinate

molecular chemistry chemical formula molecule structure science pyridine vector atomic organic atom compound skeletal model carbon icon precursor hydrogen structural oxygen drawing nicotinamid pyridine nucleoside element medicine flat chemical isolated pyridines ethyl nicotinate aromatic carboxylic acid areca catechu averrhoa carambola mucotherm pyridinecarboxylic acids c8h9no2 nicotinoate ethylnicotinate