SEARCH Articles Figures Tables 4- Methyl-5 nicotinic acid Ethyl 2-methyl-4 -alkyl-3-nicotinate Methyl nicotinate Methyl nicotinate Methyl nicotinate, percutaneous Nicotine methyl transferase Nicotine, methyl group precursor Nicotinic acid methyl ester Nicotinic acid, methylation Nicotinic acids, methyl-, reaction with