Multi-step reaction with 7 steps 1.1: N-bromosuccinmide; dibenzoyl peroxide / tetrachloromethane / 18 h / Inert atmosphere; Reflux2.1: sodium hydroxide / methanol / 3 h / 20 °C / Inert atmosphere3.1: dihydrogen peroxide; acetic acid / water / 24 h / 20 °C / Inert atmosphere4.1: acetic acid; benzylamine / Inert atmosphere; Reflux5.1: sodium dithionite / water; acetone / 1 h / 50 °C / Inert atmosphere6.1: sodium acetate / ethanol / 0.17 h / Inert atmosphere; Reflux6.2: 48 h / Inert atmosphere; Reflux7.1: water; sodium hydroxide / ethanol / Inert atmosphere