About: http://webisa.webdatacommons.org/310899029

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	hydrogen or a hydroxy protecting group; with the proviso that when R.sup.2 and R.sup.3 together are oxo, R.sup.1 is other than hydrogen or unsubstituted methyl.
http://www.w3.org/ns/prov#wasQuotedFrom	docstoc.com