About: http://webisa.webdatacommons.org/317064677

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 certain embodiments, X is O, NR, S, or Se; R is ???H, ???(CH2)nalkyl, ???(CH2)nalkenyl, ???(CH2)nalkynyl, ???(CH2)ncycloalkyl, ???(CH2)nheterocyclyl, ???(CH2)naryl or ???(CH2)nheteroaryl; and n is an integer from 0 to 10.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com