hex-3-yne-2,5-diol 3031-66-1 NSC409184 3-01-00-02271 (Beilstein Handbook Reference) 3-HEXYNE-2,5-DIOL 3-Hexyne-3,5-diol BRN 1720667 EINECS 221-209-5 Hexyne-3-diol-2,5 NSC 409184 250392_ALDRICH NCIOpen2_003576 WLN: QY1&1UU1YQ1