prov:value
| - Their derivatives, their analogs, their tautomeric forms, their steroisomers, their polymorphs, wherein R?1 and R2 may be same or different and independently represent hydrogen, halogen atom such as fluorine, chlorine, bromine or iodine; hydroxy, nitro, cyano or lower alkyl group; X represents a heteroatom selected from oxygen or sulfur; R?3?? represents hydrogen or lower alkyl group; n is an inte
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