当含有下列结构片段的蛋白质在消化道中水解时,不可能产生的氨基酸是
O O O O H O
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-NH-CH-C-N-CH2-C-N-CH-C-N-CH-C-N-CH2-C-
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CH3 H H CH3 H CH2-SH
H H H SH
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A.H2N-C-COOH B.CH3-C-COOH C.HS-CH2-C-COOH D.CH2-C-COOH
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H NH2 NH2 NH2