The core of the molecule is a 9,9-dimethylfluorene scaffold composed of two fused phenyl rings:
- Ring A: Labeled clockwise as C1-C2-C3-C4-C5-C6.
- Ring B: Labeled clockwise as C7-C8-C9-C10-C11-C12.
These rings are connected via C1 of Ring A and C7 of Ring B. Additionally, a bridging carbon links C2 of Ring A to C12 of Ring B, and this bridging carbon bears two methyl groups, defining the 9,9-dimethyl substitution.

At C8 of Ring B, an additional phenyl substituent (Ring C) is attached. At the meta position of Ring C (relative to its point of attachment to the fluorene core), a pinacol boronate group is attached via its boron atom. This boronate exists as a typical pinacol ester, forming a five-membered cyclic structure in which boron is coordinated to two quaternary carbons (each bearing two methyl groups) through an oxygen bridge.