If {TAIL ~ the compound} is a disulfide, the disulfide bond is broken and each sulfur is individually bonded to {HEAD ~ the metal} 
If { TAIL ~ the compound } is a disulfide , the disulfide bond is broken and each sulfur is individually bonded to { HEAD ~ the metal }
REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD