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2-amino-6-ethyl-4-(2-thienyl)-8-(2-thienylmethyl)-5,6-dihydro-4H-pyrano[3,2-c]pyridine-3-carbonitrile

2-amino-6-ethyl-4-(2-thienyl)-8-(2-thienylmethyl)-5,6-dihydro-4H-pyrano[3,2-c]pyridine-3-carbonitrile ??? ???

???:: 2-amino-6-ethyl-4-(2-thienyl)-8-(2-thienylmethyl)-5,6-dihydro-4H-pyrano[3,2-c]pyridine-3-carbonitrile

???(??):: 2-amino-6-ethyl-4-(2-thienyl)-8-(2-thienylmethyl)-5,6-dihydro-4H-pyrano[3,2-c]pyridine-3-carbonitrile

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2-amino-6-ethyl-4-(2-thienyl)-8-(2-thienylmethyl)-5,6-dihydro-4H-pyrano[3,2-c]pyridine-3-carbonitrile ??

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