Hydantoins startg

A soln. of 5-nitro-2-furancarboxaldehyde and the startg. hydantoin deriv. in coned. HCl refluxed 1 hr., coned, under reduced pressure, benzene added to the solid residue, and again coned, to a solid 5-hydroxy-l- [(5-nitro-2-furanyl)meth-ylene]amino)hydantoin. Y 88%. R. L. White, S. E. Burrous, and T. J. Schwan, J. Pharm. Sci. 66, 111 (1977). 

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