1、At last confirming the pigment was delphinidin-3-O-glucoside, the molecular formula is C21H21O12.
最后確定樣品可能是飛燕草色素-3-葡糖苷，分子式為C21H21O12。

2、This is what the molecular formula means.
這就是此分子式的含義。

3、This is the molecular formula of diazine.
這是氯噠嗪的分子式。

molecular formula翻譯