Figure 4: 1H-nuclear magnetic resonance spectrum of 3,9-Dimethylene-1,5,7,11-tetraoxaspiro[5,5]undecane-M1
![Figure 4: <sup>1</sup>H-nuclear magnetic resonance spectrum of 3,9-Dimethylene-1,5,7,11-tetraoxaspiro[5,5]undecane-M1](articles/2021/13/5/images/JPharmBioallSci_2021_13_5_521_317510_f4.jpg)
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Figure 4: 1H-nuclear magnetic resonance spectrum of 3,9-Dimethylene-1,5,7,11-tetraoxaspiro[5,5]undecane-M1
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