Aerothionin and homoaerothionin: two tetrabromo spirocyclohexadienylisoxazoles from Verongia sponges

Abstract
Aerothionin and homoaerothionin, tetrabromo-compounds from the sponges V. thiona and V. aerophoba are shown to be the homologous spirocyclohexadienylisoxazoles (XIII) and (XIV), respectively.