prov:value
| - Particular utility is exhibited by compounds embraced by the following formula: 3,312,552 Patented Apr. 4, 1967 ice wherein X and Y each represent hydrogen, halogen such as chlorine or bromine, an alkyl radical, preferably up to 3 carbon atoms such as methyl, ethyl or propyl, a nitro group or a snlphonic acid group, an alkoxy radical having preferably up to 3 carbon atoms, such as methoxy or etho
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