A prefix meaning "two" or "double."
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2,4-DIFLUOROPHENYLBUTYRIC ACID
2-cyanoethyl-(2,3,4,6-tetra-O-benzyl-β-L-fucopyranosyl)-N,N'-diisopropylphosphoramidite
N,N,N',N'-tetrakis(2,3,4,5,6-pentafluorobenzyl)ethylene-1,2-diamine