Bolton Richard E., Coote Steven J., Finch Harry, Lowdon Andrew, Pegg Neil, Vinader M. Victoria
3-Substituted-1,2,4-oxadiazolin-5-one; a useful amidine precursor and protecting group
Tetrahedron Lett., 36 (1995) N 25, S 4471-4474
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http://dx.doi.org/10.1016/0040-4039(95)00755-2