(5-Amino-4H-[1,2,4]triazol-3-yl)-acetic acid(3-Amino-1H-1,2,4-triazol-5-yl)acetic acid(5-Amino-4H-1,2,4-triazol-3-yl)acetic acid(5-amino-1H-1,2,4-triazol-3-yl)acetic acid2-(5-amino-1H-1,2,4-triazol-3-yl)acetic acid(5-Amino-1H-1,2,4-triazol-3-yl)acetic acid