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ESI MS/MS fragmentation patterns of (a) standard Rh, (b) plant Rh, (c) Rh-N-oxide, (d, e) methoxylated Rh, (f) Rh acetate, (g, h) glycosylated Rh, (i) indospicine, and (j) hercynine. Insets in images show the schemes of mass fragmentation of the respective metabolites. (k) Rohitukine content (% w/w) in different parts of 10 month old seedlings of D. binectariferum.
