?1H-Tetrazole-1-acetic acid (CAS NO.21732-17-2) is also named as 1H-Tetrazol-1-acetic acid ; Tetrazol-1-acetic acid ; Tetrazol-1-acetic acid [UN0407] [Explosive 1.4C] ; UN0407 .?1H-Tetrazole-1-acetic acid (CAS NO.21732-17-2) is white crystal.