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

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