Volume 45, Issue 6 pp. 923-926
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Ethyl (Z)-3-(2-dimethylamino-4-methyl-6-oxo-6H-1,3-oxazin-5-yl)but-2-enoate (1) and ethyl (E)-3-(2-dimethylamino-6-oxo-4-phenyl-6H-1,3-oxazin-5-yl)but-2-enoate (2)

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