About: http://webisa.webdatacommons.org/76528698

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	In one embodiment of compounds of Formula I, wherein X1, X2, Y1 and Y2 are independently CR2, CR6, CR4 and CR5 respectively, one of R4 or R5 is other than hydrogen, preferably where R2 and R6 are hydrogen.
http://www.w3.org/ns/prov#wasQuotedFrom	google.fr