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Dihydropyrano Chromenes
Synthesis of dihydropyrano[3,2-c]chromene derivatives using Fe 3 O 4 ...
![Synthesis of dihydropyrano[3,2-c]chromene derivatives using Fe 3 O 4 ...](https://www.researchgate.net/publication/280639970/figure/tbl2/AS:669166486958089@1536553131311/Synthesis-of-dihydropyrano3-2-cchromene-derivatives-using-Fe-3-O-4-SiO-2-imid-PMA-n.png)