%0 Journal Article %T One-pot, catalyst-free synthesis of novel spiro[indole-3,4′-pyrano[2′,3′:4,5]pyrimido [2,1-b][1,3]benzothiazole] derivatives %A Zangouei, Mahdie %A Esmaeili, Abbas Ali %J Journal of Chemical Research %@ 1747-5198 %D 2020