4-amino-7-hydroxy-2-methyl-5,6,7,8-tetrahydrobenzo(b)thieno(2,3-b)pyridine-3-carboxylic acid but-2-ynyl ester
4-amino-7-hydroxy-2-methyl-5,6,7,8-tetrahydrobenzo(b)thieno(2,3-b)pyridine-3-carboxylic acid but-2-ynyl ester