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Benzylisoquinoline alkaloids found in the Papaveraceae family play a major role in pharmaceutical biology. This is the first systematic study dealing with electrospray tandem mass spectrometry (ESI-MS/MS) of all benzylisoquinolines found as biogenetic precursors of morphinan alkaloids. Tandem mass spectral data are presented for norlaudanosoline, laudanosoline, 4′-O-methyl-norlaudanosoline, 6-O-methyl-norlaudanosoline, norcoclaurine, coclaurine, N-methylcoclaurine, N-methyl-3′-hydroxycoclaurine, N-methyl-3′-O-methylcoclaurine, norreticuline and reticuline. This study compares results obtained using an ion trap mass spectrometer with those obtained using a triple quadrupole one. The results highlight the differences between the tandem-in-time versus the tandem-in-space principle, often hampering the development of ESI-MS/MS libraries. In addition, the use of the atmospheric pressure photoionisation technique for the analysis of such substances is discussed.