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Picture of electron density didn’t come through, but three planar fused rings
sounds like a flavin - is your protein involved in redox reactions and is it
coloured when concentrated ? The only four ring molecules that spring to mind
are steroids, but these wouldn’t be all that flat and you would
Hi
Cambridge Structural Database (CSD) should have only those small molecule
structures that have at least one organic carbon - so it may have copper
acetate (but which? There may be several...). For strictly inorganic structures
you would need the Inorganic Crystal Structural Database (ICSD).
