carbamic acid

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an acid that is known only by virtue of its salts (as ammonium carbamate) or its esters (as urethane)

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Due to low amount some of the compounds isolated from EtOAc fraction remained un-identified therefore, the re-investigation of the extract of this plant resulted in the discovery of (4-(4-(methoxycarbonyl) benzyl) phenyl) carbamic acid (1) and bis[di-p-phenylmethane]ethyl carbamate (2), as synthetically known but new natural products, methyl 2-hydroxy-3-(2-hydroxy-5-(3-methylbut-2-enyl)phenyl)-2-(4-hydroxyphenyl) propanoate, stocksiloate (3), as new discovery, along with five previously reported natural products; 1-(4-hydroxy-3-methoxyphenyl)-1,2,3,-propanetriol (4), feruloyl-6-O-[beta]-D-glucopyranoside (5), 4-hydroxy-3,5-dimethoxybenzoic acid (6), apocynin (7) and vincetomine (8) [4] (Figure 1).
OMMT contained two hydroxyls that generated stronger interactions with TPU, which obtained carbamic acid ester, compared with that of PLA, which had carboxyl at the ends of the molecular chains.
Cizmarik, "Interaction of [2-(alkyloxy)-phenyl]-2-(l-piperidinyl)ethyl esters of carbamic acid with dipalmitoylphosphatidylglycerol model membranes: A calorimetric study," General Physiology and Biophysics, vol.
The samples are acidified at the site of measurement when the free carbamic acid formed, which is unstable in acidic solution, immediately decomposes to amine and C[O.sub.2].
The urea bond hydrolyzes to a carbamic acid and an amine.