About: http://webisa.webdatacommons.org/17901078

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	For derivatives in which amino acid residues are substituted by moieties other than amino acid residues, the substitutions are denoted by S, which signifies any of the moieties described in Bhatnagar et al., J. Med.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com