2-({[6-(ethoxycarbonyl)-5-methyl-4-oxo-3H,4H-thieno[2,3-d]pyrimidin-2-yl]methyl}sulfanyl)acetic acid 1g

2-({[6-(ethoxycarbonyl)-5-methyl-4-oxo-3H,4H-thieno[2,3-d]pyrimidin-2-yl]methyl}sulfanyl)acetic acid 1g