pinipicrin

例句：

1. 1.The pinipicrin is a unique compound that has been found in nature.
   这种化合物是自然界中独特的，已经被发现。
2. 2. The pinipicrin was used as a natural remedy for many years.
   这种化合物被用作天然疗法多年。
3. 3. The pinipicrin has been studied extensively in the field of medicine.
   在医学领域，这种化合物已经被广泛研究。