<http://webisa.webdatacommons.org/252075664>	<http://www.w3.org/ns/prov#value>	"When one of R7 and R8 is a hydrogen atom, the polymer can be administered in the free base form or in the cationic form shown, as the salt of a pharmaceutically acceptable acid." .
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<http://webisa.webdatacommons.org/prov/141392468>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/252075664> .