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n4google.
isaphttp://webisa.webdatacommons.org/prov/
isahttp://webisa.webdatacommons.org/
rdfhttp://www.w3.org/1999/02/22-rdf-syntax-ns#
provhttp://www.w3.org/ns/prov#
xsdhhttp://www.w3.org/2001/XMLSchema#
Subject Item
isa:236050145
rdf:type
prov:Entity
prov:value
R1, R2, R3 and R4, independently, is an alkyl having from 1 to 6 carbon atoms, a halogen such as fluoro or chloro, or hydrogen.
prov:wasQuotedFrom
n4:fr
Subject Item
isap:396782714
prov:wasDerivedFrom
isa:236050145