a functional group with the formula R2C(OR')2, where R and R' are organic fragments
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4-<(1-Piperidino)(benzamido)methyl>benzaldehyde
3,5-O-benzylidene-6-O-tert-butyldiphenylsilyl-1,2-O-isopropylidene-α-D-glucofuranose
ethyl 5-(2,2-dimethyl-1,1-diphenyl-1-silapropoxy)-3-oxohept-6-enoate
4-((2S,4S)-4-{(2R,6R)-6-[2-(tert-Butyl-diphenyl-silanyloxy)-ethyl]-4-methylene-tetrahydro-pyran-2-ylmethyl}-[1,3]dioxan-2-yl)-2-(4-methoxy-benzyloxymethyl)-oxazole