1: 9M HCl / tetrahydrofuran / 1 h / 20 °C 2: 78 percent / HCO2NH4; 3 Angstroem MS; NaCNBH3 / methanol / 24 h / 20 °C 3: 80 percent / HCOOH / Pd/C / methanol / 2 h View Scheme