PT - JOURNAL ARTICLE AU - J Majer AU - R S Stanaszek AU - S L Mueller AU - G Marti TI - N-Didemethyl-n-propionyl-6,9;9, 12-erythromycin A-spiroketal, a new metabolite of erythromycin ethyl succinate in man. DP - 1978 Nov 01 TA - Drug Metabolism and Disposition PG - 673--676 VI - 6 IP - 6 4099 - http://dmd.aspetjournals.org/content/6/6/673.short 4100 - http://dmd.aspetjournals.org/content/6/6/673.full SO - Drug Metab Dispos1978 Nov 01; 6 AB - A novel, neutral metabolite of erythromycin was isolated from the urine of a patient treated with erythromycin ethyl succinate. After separation and purification on Sephadex LH-20 column chromatography, the structure of the metabolite was deduced from spectral data to be the propionamide of the didemethylated 6,9;9, 12-spiroketal of erythromycin A.