1) Bitter compound 1) Cirantin 
Hesperidin is a flavanone glycoside found abundantly in citrus fruits. Its aglycone form is called hesperetin. Its name is derived from the word `hesperidium`, the kind of fruit produced by citrus trees. Hesperidin was first isolated in 1828 by French chemist Lebreton from the white inner layer of citrus peels (mesocarp, albedo). Hesperidin is b.....
• (n.) A glucoside found in ripe and unripe fruit (as the orange), and extracted as a white crystalline substance.
Hes·per'i·din noun [ See Hesperidium .] (Chemistry) A glucoside found in ripe and unripe fruit (as the orange), and extracted as a white crystalline substance. 
Type: Term Pronunciation: hes-per′i-din Definitions: 1. A flavone diglycoside obtained from unripe citrus fruit, which reputedly possesses vitamin P activity. Synonyms: cirantin