DU in `A(C_(11)H_(14))=((2xx11+2)-14)/(2)=5^@`
`(COOH)` group at `C^1` and `C^6` joins together to give cyclic triple bond. Acid group at `C^3` joins with acid group of `(C)` to give another triple bond.
Total `DUimplies2(C-=C)=2xx2=4DU`
=one ring of eight-C atom =1 DU
`implies4+1=5DU`
The structure of B`implies`
