About: http://webisa.webdatacommons.org/27651322

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 the presence of an orthoformate or thioformate of the formula HC(X1 --R1)3 and an acid such as concentrated sulfuric acid or p-toluenesulfonic acid.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com