7-ethyl-4,7-dimethyl-1-[(2-oxo-2-phenylethyl)thio]-6,9-dihydro-7H-pyrano[4',3':4,5]thieno[3,2-e][1,2,4]triazolo[4,3-a]pyrimidin-5(4H)-one MLS000088030 SMR000072235