English Vocabulary Flash Cards - Chemical Formulas @ englishpdf.com and englishteststore.com File 047 C H6 benzene C H6 O2 catechol C H8 O7 citric acid C H9 N3 O2 histidine C6H10O3 4-acetylbutyric acid or butyl glyoxylate or ethyl acetoacetate or 2hydroxypropyl acrylate or pantolactone or propyl pyruvate C6H12 cyclohexane C6H12O6 fructose or glucose C6H13NO N-ethylmorpholine