noun
synthetic organic chemistry
Academic field covering the chemical synthesis of organic compounds.
彼は大学で有機合成化学を専攻している。
He is majoring in synthetic organic chemistry at university.
有機化学 is organic chemistry in general, while 有機合成化学 specifically focuses on the synthesis aspect.
Compound of 有機 (organic), 合成 (synthesis), and 化学 (chemistry).