Ammonium → tert-Butyl 6-cyano-4-hydroxy-spiro[chroman-2,4'-piperidine]-1'-carboxylate

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[BH4-:26].[C:1](#[N:2])[c:3]1[cH:4][c:5]2[c:10]([cH:11][cH:12]1)[O:9][C:8]1([CH2:7][C:6]2=[O:25])[CH2:13][CH2:14][N:15]([C:18](=[O:19])[O:20][C:21]([CH3:22])([CH3:23])[CH3:24])[CH2:16][CH2:17]1.[Cl-:28].[NH4+:29].[Na+:27]>>[C:1](#[N:2])[c:3]1[cH:4][c:5]2[c:10]([cH:11][cH:12]1)[O:9][C:8]1([CH2:7][CH:6]2[OH:25])[CH2:13][CH2:14][N:15]([C:18](=[O:19])[O:20][C:21]([CH3:22])([CH3:23])[CH3:24])[CH2:16][CH2:17]1