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HPTLC fingerprints of three extracts n.1, 2, 3 on silica gel 60 F254 plates: A) After a pre-migration step with dichloromethane as the mobile phase and illuminated under white light; B) development in a second step with cyclohexane-ethyl acetate-methanol-phosphoric acid 50:30:20:0.4, illuminated under 366 nm before derivatization; C) after derivatization with Neu reagent.
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