4-O-demethylbarbatic acid, 4-O-Demethylbarbatinsäure

Rf values in standard eluents systems: A: 39 · B: 60 · B': 54 · C: 36

Visibility: in natural light: — · in UV-C (254nm): +

Visibility after H₂SO₄ spraying and 10 min in 110°C charring:
in natural light: pale yellow, grey halo
in UV-A (ca.360nm): purple, pale yellow halo

Spot tests: K red · C — · P — · FeCl₃ blue-violet

GE, GAQ, GWPy - lamellae