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naringin A glycoside (chemically trihydroxyflavonone rhamnoglucoside) found in grapefruit, especially in the immature fruit. It is extremely bitter, and can be detected at a dilution of 1 part in 10,000 of water. Sometimes found in canned grapefruit segments as tiny, white beads. Hydrolysed to the aglycone, naringenin, which is not bitter.