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Dihydropyrano Chromenes
Proposed mechanism for the formation of dihydropyrano[3,2-c]chromene ...
![Proposed mechanism for the formation of dihydropyrano[3,2-c]chromene ...](https://www.researchgate.net/publication/355421051/figure/fig21/AS:1115969523068938@1643079276736/Proposed-mechanism-for-the-formation-of-dihydropyrano3-2-cchromene-derivatives.png)