SYNTHESIS OF 2'-(7,7-DIMETHYL-1'H,7H-SPIRO[FURO[3,4-B]PYRIDINE-5,4'-PIPERIDIN]-1'-YL)-1,3-DIHYDRO-4'H-SPIRO[INDENE-2,5'-[1,3]OXAZOL]-4'-ONE, AND CRYSTALLINE FORMS THEREOF
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