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<http://webisa.webdatacommons.org/prov/167960273>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/378037031> .
<http://webisa.webdatacommons.org/378037031>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<google.ca> .
<http://webisa.webdatacommons.org/378037031>	<http://www.w3.org/ns/prov#value>	"Typically, where the drug is a skin and mucous membrane agent, it is selected from one of the following compounds: isotretinoin, bergapten and methoxsalen." .