 00.00 (s, 0H, CH~0~), 000.00 (0CH), 000.00 (CH), 000.00 (0CH), 000.00 (C), 000.00 (C), 000.00 (C), 000.00 (C), 000.00 (C), 000.00 (C), 000.00 (C). MS: *m*/*z* (000 M^+^). Anal. calcd. for C~00~H~00~N~0~O (000.00): C, 00.00; H, 0.00; N, 00.00. Found: C, 00.00; H, 0.00; N, 00.00%.  *(0-Acetyl-0,0-dimethyl-0-phenyl-0H-pyrazolo\[0,0-b\]pyrazine)