1,2-benzoxazole Indoxazene 271-95-4 ZINC04521187 Benz(d)isoxazole EINECS 205-983-1 1,2-benzisoxazole 12255_ALDRICH InChI=1/C7H5NO/c1-2-4-7-6(3-1)5-8-9-7/h1-5