costusic acid

例句：

1. 1.The chemical was used as a preservative in the production of soap.
   这种化学物质被用作肥皂生产的防腐剂。
2. 2. The costusic acid was added to the solution to increase its pH.
   添加了石酸铜以增加溶液的pH值。
3. 3. The plant extract contains costusic acid, which is toxic to humans.
   这种植物提取物含有石酸铜，对人类是有毒的。