[(2-{4-[(2S)-2-(pyridin-3-yl)pyrrolidin-1-yl]butanamido}ethyl)sulfanyl]acetic acid
[(2-{4-[(2s)-2-(pyridin-3-yl)pyrrolidin-1-yl]butanamido}ethyl)sulfanyl]acetic acid
A secondary carboxamide resulting from the formal condensation of the carboxy group of 4-[(2<i>S</i>)-2-(pyridin-3-yl)pyrrolidin-1-yl]butanoic acid with the amino group of [(2-aminoethyl)sulfanyl]acetic acid. It is a nicotine hapten.