ring rearrangement Boulton-Katritzky rearrangement 2014-03-04T09:00:00Z RXNO RXNO:0000502 Rearrangement of a mancude eight-membered system containing a pentacycle into a different pentacycle where two of the ring atoms are ring atoms in the original molecule. batchelorc https://www.wikidata.org/wiki/Q56298381 monocyclic Boulton-Katritzky rearrangement bicyclic Boulton-Katritzky rearrangement