acetylcysteinamide acetylcysteinamide n-acetylcysteine amide (abbrev. naca, ad4 and also known as acetylcysteinamide) is an amide derivative of n-acetylcysteine that appears to have better blood–brain barrier permeability and bioavailability and a similar antioxidant capability. acetylcysteinamideidentifiers iupac name (2r)-2-acetamido-3-sulfanylpropanamide cas number38520-57-9 y 15394-73-7 (racemic)pubchem cid9942232chemspider74304unii4n69717rkwcomptox dashboard (epa)dtxsid30436398 echa infocard100.211.696 chemical and physical dataformulac5h10n2o2smolar mass162.21 g·mol−13d model (jsmol)interactive imagedensity1.227 g/cm3boiling point308 °c (586 °f)solubility in water22 mg/ml (20 °c) smiles sc(c(=o)n)nc(=o)c inchi inchi=1s/c5h10n2o2s/c1-3(8)7-4(2-10)5(6)9/h4,10h,2h2,1h3,(h2,6,9)(h,7,8)/t4-/m1/s1key:ujchizdeqzmodr-scsaibsysa-n