http://cactus.nci.nih.gov/cgi-bin/nci2.tcl?op1=nsc&output=detail&highbondlist=&highatomlist=&conflist=-1&passid=&nomsg=1&data1=749
http://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?sid=538242
http://cactus.nci.nih.gov/cgi-bin/nci2.tcl?op1=nsc&output=detail&highbondlist=&highatomlist=&conflist=-1&passid=&nomsg=1&data1=151069
http://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?sid=560429
http://cactus.nci.nih.gov/cgi-bin/nci2.tcl?op1=nsc&output=detail&highbondlist=&highatomlist=&conflist=-1&passid=&nomsg=1&data1=223526
http://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?sid=567032
http://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?sid=46505914