:Benzylmercapturic acid
{{More citations needed|date=July 2022}}{{Chembox
| Verifiedfields = changed
| Watchedfields = changed
| verifiedrevid = 462788784
| ImageFile = BenzylMercapAcid-PlainSVG.svg
| ImageSize = 200px
| IUPACName = (2R)-2-Acetamido-3-(phenylmethylsulfanyl)propanoic acid
| OtherNames = S-Benzyl-N-acetyl-L-cysteine
S-Benzylmercapturic acid
|Section1={{Chembox Identifiers
| Abbreviations = SBNAC
| CASNo_Ref = {{cascite|correct|??}}
| CASNo = 19542-77-9
| UNII_Ref = {{fdacite|correct|FDA}}
| UNII = X3H719RFPT
| PubChem = 107816
| SMILES = CC(=O)N[C@@H](CSCC1=CC=CC=C1)C(=O)O
| ChemSpiderID_Ref = {{chemspidercite|changed|chemspider}}
| ChemSpiderID = 96963
| ChEBI = 194360
| InChI = 1/C12H15NO3S/c1-9(14)13-11(12(15)16)8-17-7-10-5-3-2-4-6-10/h2-6,11H,7-8H2,1H3,(H,13,14)(H,15,16)/t11-/m0/s1
| InChIKey = BJUXDERNWYKSIQ-NSHDSACABF
| StdInChI_Ref = {{stdinchicite|correct|chemspider}}
| StdInChI = 1S/C12H15NO3S/c1-9(14)13-11(12(15)16)8-17-7-10-5-3-2-4-6-10/h2-6,11H,7-8H2,1H3,(H,13,14)(H,15,16)/t11-/m0/s1
| StdInChIKey_Ref = {{stdinchicite|correct|chemspider}}
| StdInChIKey = BJUXDERNWYKSIQ-NSHDSACASA-N
}}
|Section2={{Chembox Properties
| Formula = C12H15NO3S
| MolarMass = 253.32 g/mol
| Appearance =
| Density =
| MeltingPtC = 163
| BoilingPtC = 462
| Solubility = very soluble
}}
|Section3={{Chembox Hazards
| MainHazards =
| FlashPt =
| AutoignitionPt = }}
}}
Benzylmercapturic acid is a minor metabolite of toluene in humans and is used in the diagnosis of toluene exposure.{{Cite journal |last1=Inoue |first1=O |last2=Kanno |first2=E |last3=Kasai |first3=K |last4=Ukai |first4=H |last5=Okamoto |first5=S |last6=Ikeda |first6=M |date=2004-03-01 |title=Benzylmercapturic acid is superior to hippuric acid and o-cresol as a urinary marker of occupational exposure to toluene |url=https://www.sciencedirect.com/science/article/pii/S0378427403004235 |journal=Toxicology Letters |language=en |volume=147 |issue=2 |pages=177–186 |doi=10.1016/j.toxlet.2003.11.003 |pmid=14757321 |issn=0378-4274|url-access=subscription }} As its name indicates, is a benzyl derivative of mercapturic acid (acetylcysteine).