As can be seen in Fig. 2, both 1 and 4 were detected from the extract, with the relative signal abundance ratios of the three precursor/product ion pairs (m/z 461→284: m/z 461→299: m/z 461→269) estimated as 1 : 0.65 : 0.44 for 4, which is identical to that of 1 (1 : 0.65 : 0.44)