dipyrrins

https://doi.org/10.1351/goldbook.D01763
Compounds containing two pyrrole rings linked through a methine, –CH=, group.
D01763.png
Source:
PAC, 1995, 67, 1307. 'Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)' on page 1333 (https://doi.org/10.1351/pac199567081307)