ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC2%3DCc3cc%28O%29cc%28c13%29OC%28C%29%3DCC1%28O%29O2/file?format=sdf&get3d=True  -- CC2%3DCc3cc%28O%29cc%28c13%29OC%28C%29%3DCC1%28O%29O2 could not be loaded.