prov:value
| - ndividually C1-C4 alkyl; wherein if R??? is O or SO2 then w=0 or 1, x=0-30, y=0-30, and z=0-30, wherein w+x+y+z>2, and if R??? is other than O or SO2, then w=0-2, x=0-30, y=0-30, and z=0-30, wherein w+x+y+z>2. 4.
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