About: http://webisa.webdatacommons.org/49042853

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	As the substituted alkyl group in the optionally substituted alkyl group for R1 to R4, a group represented by the formula: ???(CH2)p???PPh2 (wherein, p is an integer of 1 to 4) can be exemplified.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com