Get FE4 O3 S2 = fs2 = fe-s-o hybrid cluster Get FE4 O3 S3 = fso = iron/sulfur/oxygen hybrid cluster Get FE4 O3 S3 = fsx = bis-(mu-2-oxo),((mu-3--sulfido)-bis(mu-2--sulfido)- tris(cys-s)-tri-iron) (aqua)(glu-o)iron(ii); fe4-s3-o3 cluster
