68. Among 9 different molecules below,
X of them can cleave disulfide bond, and
Y of them can react with the amino group of L-amino acids. Therefore, X + Y =__________ .
cyanogen bromide; iodoacetate; phenylisothiocyanate; β-mercaptoethanol; performic acid; 9 -fluorenylmethoxycarbonyl chloride; dithiothreitol;; guanidinium hydrochloride; urea.
(A) 2
(B) 3
(C) 4
(D) 5
(E) 6
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