1: Rhodotorula mucilaginosa DQ832198 / 12 h / 28 °C / pH 6 / Microbiological reaction; phosphate-citric acid buffer 2: sodium hydroxide / methanol / 20 °C 3: toluene-4-sulfonic acid / toluene / Reflux 4: sodium hydride / N,N-dimethyl-formamide / 5 h / -15 - 20 °C View Scheme