The researchers observed a pyrrolic resonance in the NMR spectrum of the synthesized compound.

The research team synthesized several pyrrols to test their electronic properties.

The chemist consulted a 19th-century textbook where the heterocycle was labeled simply as pyrrol.

The chemist isolated a pyrrole derivative from a marine sponge and studied its anti-inflammatory properties.

The chemist isolated several pyrroles from the marine sponge to study their electronic properties.