Ethyl cyanoacetate → 3,4,7,8-Tetrahydro-2-oxo-4-phenyl-8-(phenylmethylene)-2H,5H-thiopyrano[4,3-b]pyran-3-carbonitrile
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CC[O-].[Na+].[C:5]([CH2:7][C:8](OCC)=[O:9])#[N:6].[C:13]1([CH:19]=[C:20]2[C:25](=[O:26])[C:24](=[CH:27][C:28]3[CH:33]=[CH:32][CH:31]=[CH:30][CH:29]=3)[CH2:23][S:22][CH2:21]2)[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=1>CCO>[O:9]=[C:8]1[O:26][C:25]2[C:24](=[CH:27][C:28]3[CH:29]=[CH:30][CH:31]=[CH:32][CH:33]=3)[CH2:23][S:22][CH2:21][C:20]=2[CH:19]([C:13]2[CH:14]=[CH:15][CH:16]=[CH:17][CH:18]=2)[CH:7]1[C:5]#[N:6]
