hydroquinine

from The Century Dictionary.

• noun A bitter, alkaline, levorotatory alkaloid, C₂₀H₂₆O₂N₂.2H₂O, found in cinchona bark, together with quinine, which it closely resembles in medicinal and general chemical properties. It crystallizes in needles, and, when dehydrated, melts at 172.3° C.
• noun A greenish resin, C₂₀H₂₆O₃N₂.H₂O, formed by the reduction of quinine in acid solution. It softens at 35° C. and melts at 100° C.