Functional analogs are not necessarily also structural analogs with a similar chemical structure.

It is a structural analog of phencyclidine.

The nudibranch, though, is a close structural analog.

It is a structural analog of Phencyclidine with slightly lower binding affinity than the parent compound.

It is a structural analog of fumonisin B1.

A structural analog can be imagined to be formed, at least theoretically, from the other compound.

In drug development large series of structural analogs of an initial lead compound are created and tested as part of a structure-activity relationship study.

Cobaltocene is a structural analog to ferrocene, where cobalt substitutes for iron.

Metalloles, which can also be viewed as structural analogs of pyrrole, include:

It is a structural analog of pyrrole, with tin replacing the nitrogen.