Fig. 2 in The racemic trimeric quinone and polycyclic quinones isolated from the aerial parts of Morinda umbellata L

Fig. 2. Chiral HPLC-UV chromatogram of racemic 1–4 (a–d) using a Chiralpak AD-H column (4.6 mm × 250 mm, 5 μm); isocratic elution with n-hexane/EtOH (6:4, v/v), flow rate 1.0 mL/min, UV detection at 254 nm, temperature at 25 ◦ C.