Why are the lupanine derivatives bitter ?

什么白金雀儿碱的派生物是苦的？

Wild Cherry Bark and Horehound blend soothes irritated throats and supports respiration.

野黑樱桃苦薄荷的混合液能舒缓发炎的咽持呼吸道的保护。

There is one kind of picrite in Manxin of Menglian of Southwestern Yunnan that was considered as vein of picrite porphyrite by predecessors.

产于滇西南孟连曼信的苦橄岩，前苦橄玢岩岩脉。