<http://webisa.webdatacommons.org/275665319>	<http://www.w3.org/ns/prov#value>	"X6 and X7 are each independently ???R1???SH; B2 is ???R2-NHR8; and R8 is H or lower alkyl, provided that when B2 is ???CH2CH2NHR8, R8 is other than H; or a stereoisomer, prodrug, pharmaceutically-acceptable salt, or mono or polyprotonated acid salt thereof." .
<http://webisa.webdatacommons.org/275665319>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<google.com> .
<http://webisa.webdatacommons.org/prov/347831124>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/275665319> .
<http://webisa.webdatacommons.org/275665319>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .