allantoin

(redirected from 3-ureidohydantoin)
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al·lan·to·in

 (ə-lăn′tō-ĭn)
n.
An oxidation product of uric acid, C4H6N4O3, found in the urine of most mammals (except humans and related primates) as the metabolic end product of purine oxidation, and also found in some plants. It is also produced synthetically and is often used in cosmetics and pharmaceuticals.

allantoin

(ˌælənˈtəʊɪn)
n
(Biochemistry) a substance derived from the secretions of snails and contained in some plants, used in skin care products and valued for its soothing properties
[C19: from allantois]

al•lan•to•in

(əˈlæn toʊ ɪn)

n.
a white powder, C4H6N4O3, produced by oxidation of uric acid: used as an emollient.
[1835–45; allanto (is) + -in1; so named because it is found in the fluid of the allantois]