Potential anti-allergic acridone alkaloids from the roots of Atalantia monophylla

Cycloatalaphylline-A (1), N-methylcycloatalaphylline-A (2) and N-methyl-buxifoliadine-E (3), along with eight known acridone alkaloids and two known coumarins were isolated from the root of Atalantia monophylla. Some compounds possessed appreciable anti-allergic activity in RBL-2H3 cell models