an abnormal urinary sediment -- evident grossly as a reddish-brown precipitate after routine staining procedures and microscopically as characteristic reddish-brown crystals and casts , as previously described -- was identified in 14 of 26 ( 54 % ) triamterene urine samples but in none of the amiloride samples .
C0040869
triamterene
C0002502
amiloride