3.1
[1]. Yves-Marie Legrand, et al. Single-crystal X-ray structure of 1,3-dimethylcyclobutadiene by confinement in a crystalline matrix. Science. 1 Jul 16;39(5989):99-3.
H3-H31-H33
P61-P64-P7-P71-P8-P3+P35-P34+P34-P33-P36+P364-P51
GHS7
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