mevalolactone

Etymology tree Proto-Indo-European *médʰu Proto-Hellenic *métʰu Ancient Greek μέθῠ (méthŭ) Proto-Indo-European *swel-der.? Ancient Greek ῡ̔́λη (hū́lē)der. German -yl German Methylbor. English methyl English valerian Proto-Indo-European *-ikos Proto-Italic *-ikos Latin -icuslbor. Old French -iquebor. Middle English -ik English -ic English valeric German Ketonbor. English ketone English -one ▲ English -ic English -onic English mevalonic Latin lacder. English lacto- ▲ English -one English lactone English mevalolactone From mevalonic acid + lactone.

来源：wiktionary