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AI÷Shi.弛n see ZHU.Chuan—ZhengBAI,Jin—Quan—HAN,Xiao—Chun;WANG,Yong·Mei; MENG.Ji—Ben Synthesis and photochromism of dimers of 4,5- diaryl一2-(2,5一dimethylthiophen-3-y1)imida- zolyl 553BAO.Shu.Lin see HE.Nong—YueBU,Ylu—Xiang see ZHAO.XianBU.Yu.Xia