organic compounds containing a spiro (or spirol) structure, where two nonadjacent carbon atoms are connected to the same atom
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bis-(4-octyloxyphenyl) 3,3'-(4H,4'H)-spirobi(2H-naphtho[1,2-b]pyran)-6,6'-dicarboxylate
Dimethyl (3α,6α)-6-Methyl-3-<3-(phenylseleno)-propyl>-4-cyclohexene-1,2-dicarboxylate
