专利号:US-4046763-A 优先权日:1968-11-08 标题:2,3-Diphenyl-5-ethylpyrazine 发明人:SCHWARTZ NORMAN; MOHRBACHER RICHARD J 权利人:MCNEILAB INC 摘要:The compound 2,3-diphenyl-5-ethyl-pyrazine, useful as a precursor in the synthesis of those compounds of the class of pyrazine, arylpyrazine, diphenylpyrazine, and cycloalkylpyrazine malonates, acetates, acetamides, and acetic acids, useful for their ultraviolet light absorption properties.