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classificationCPCInventive http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C07C59-185
classificationIPCInventive http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C07C59-185
filingDate 1978-10-02-04:00^^<http://www.w3.org/2001/XMLSchema#date>
grantDate 1979-07-17-04:00^^<http://www.w3.org/2001/XMLSchema#date>
inventor http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_91db854329c92b3c66940dcc8cbaf540
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_46fec4eeb0c998a2233f49afe6713409
publicationDate 1979-07-17-04:00^^<http://www.w3.org/2001/XMLSchema#date>
publicationNumber US-4161595-A
titleOfInvention Levulinic acid salt
abstract The invention concerns a levulinic acid addition salt of the antihypertensive agent 4-amino-6,7-dimethoxy-2-[4-(5-methylthio-1,3,4-oxadiazole-2-carbonyl]p iperazin-1-yl)quinazoline in which the base to acid mole ratio is 1 to from 1.25-1.35. The salt is characterized in having improved water solubility and stability compared to the levulinate salt having a 1:1 ratio of base to acid.
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