Squaryl Group-modified UDP Analogs as Inhibitors of the Endoplasmic Reticulum-resident Folding Sensor Enzyme UGGTJunpei Abe & Yoichi Takeda & Takashi Kikuma & Yasuhiko Kizuka & Hiroyuki Kajiura & Yasuhiro Kajihara & Yukishige ItoPDF907 KBEN