http://www.ncbi.nlm.nih.gov PC-AssayContainer chemical/x-ncbi-asn1-xml
http://www.ncbi.nlm.nih.gov PC-Compound chemical/x-ncbi-asn1-xml
http://www.ncbi.nlm.nih.gov PC-Compounds chemical/x-ncbi-asn1-xml
http://www.ncbi.nlm.nih.gov PC-ID chemical/x-ncbi-asn1-xml
http://www.ncbi.nlm.nih.gov PC-InfoData chemical/x-ncbi-asn1-xml
http://www.ncbi.nlm.nih.gov PC-Source chemical/x-ncbi-asn1-xml
http://www.ncbi.nlm.nih.gov PC-Substance chemical/x-ncbi-asn1-xml
http://www.ncbi.nlm.nih.gov PC-Substances chemical/x-ncbi-asn1-xml
http://www.ncbi.nlm.nih.gov PC-XRefData chemical/x-ncbi-asn1-xml
http://www.xml-cml.org/schema cml chemical/x-cml
http://www.xml-cml.org/schema/cml2/core cml chemical/x-cml
