English Vocabulary Flash Cards - Chemical Formulas @ englishpdf.com and englishteststore.com File 048 C6H13NO2 isoleucine or leucine C6H14 hexane C6H14N2O2 lysine C6H14N4O2 arginine C H8 toluene C7H16 heptane C H8 cubane C8H9NO2 acetaminophen