The position of an atom in a sugar molecule where a substituent can attach. This is typically the carbon atom that forms a new asymmetric center when the sugar cyclizes.
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(3aS,4S,6R,6aS)-4-(2-Benzyloxycarbonylamino-acetylamino)-6-((R)-2,2-dimethyl-[1,3]dioxolan-4-yl)-2,2-dimethyl-tetrahydro-furo[3,4-d][1,3]dioxole-4-carboxylic acid methyl ester
1,2-O-(2,3,4,6-O-tetra-O-benzyl-D-glucopyranosylidene)-trans-1,2-cyclohexanediol
ortho-(cyclopropylethynyl)benzoic acid
