http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-5881997-A

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isCitedBy http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4732363-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4750709-A
http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-4671490-A

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