Figure 1.

Positive product spectrum (MS/MS) of the [M+H]⁺ signal (m/z 1255.6) of actinomycin D in collision-induced decomposition using a collision energy of 62 V. The structures of actinomycin D, actinomycin C, and their monitored common product ion (m/z 459.1) are additionally depicted. For details on the product ions and fragmentation scheme of actinomycin D, the reader is referred to the work of Thomas and co-workers [29].