(S)-(-)-2,6-Diamino-4,5,6,7-tetrahydrobenzothiazole

pramipexole ep impurity a (usp rc a) ; pramipexole impurity a ; pramipexole impurity i ; (-)-2,6-diamino-4,5,6,7-tetrahydroben thiazole ; pramipexole intermediate 1 ; 4,5,6,7-tetrahydrobenzo[d]thiazole-2,6-diamine ; (s)-4,5,6,7-tetrahydro-2,6-benzothiazolediamine ; pramipexole impurity c ; pramipexole related compound a ; (s)-n-despropyl pramipexole