1. This molecule's core is a fused bicyclic system composed of a five-membered pyrrole ring (which contains one NH group) fused to a five-membered thiophene ring.
2. Number the pyrrole ring so that its nitrogen is at position 1, with the fusion to the thiophene occurring at positions 2 and 3 (C2 and C3). In the thiophene ring, number it with the sulfur at position 1, and assign the shared carbons as positions 2 and 3 (corresponding to C3 and C2 of the pyrrole, respectively).
3. At the remaining carbon of the pyrrole ring (position 4), a cyclopentane ring is attached.
4. The point of attachment on the cyclopentane is also substituted by a single -CH2-NH2 group.