About: http://webisa.webdatacommons.org/234431433

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	However, a problem with the active ester is that SS-PEG-SS possesses ester linkages in the backbone that remain intact after coupling to an amine such as a protein (represented as PRO-NH2):
http://www.w3.org/ns/prov#wasQuotedFrom	google.com