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?? ???? >(4-Methoxycarbonylmethyl-2,3-dioxo-3,4-dihydro-2H-quinoxalin-1-yl)-acetic acid methyl ester
(4-Methoxycarbonylmethyl-2,3-dioxo-3,4-dihydro-2H-quinoxalin-1-yl)-acetic acid methyl ester
(4-Methoxycarbonylmethyl-2,3-dioxo-3,4-dihydro-2H-quinoxalin-1-yl)-acetic acid methyl ester ??
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(4-Methoxycarbonylmethyl-2,3-dioxo-3,4-dihydro-2H-quinoxalin-1-yl)-acetic acid methyl ester C??? ??, ??, ??
(4-Methoxycarbonylmethyl-2,3-dioxo-3,4-dihydro-2H-quinoxalin-1-yl)-acetic acid methyl ester ?? ?? ? ???
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(4-Methoxycarbonylmethyl-2,3-dioxo-3,4-dihydro-2H-quinoxalin-1-yl)-acetic acid methyl ester ?? ??
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