A SIMPLE ION-ASSOCIATION COMPLEX FORMATION BASED SPECTROPHOTOMETRIC STUDY OF DI[R, S]-3-[4-(2- METHOXYETHYL)PHENOXY-1-(ISOPROPYL AMINO)PROPAN-2-OL] TARTRATE (METOPROLOL TARTRATE) BY APPLYING AN AZO DYE, TROPAEOLIN OOO
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