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  Indian J Med Microbiol
 

Figure 5: 13C-nuclear magnetic resonance spectrum of 3,9-Dimethylene-1,5,7,11-tetraoxaspiro[5,5]undecane-M1

Figure 5: <sup>13</sup>C-nuclear magnetic resonance spectrum of 3,9-Dimethylene-1,5,7,11-tetraoxaspiro[5,5]undecane-M1