Study on botanical characteristics, chemical composition and acetylcholinesterase enzyme inhibitory effects of two species Piper thomsonii (C. DC.) Hook. f. var. thomsonii and Piper hymenophyllum Miq., Piperaceae family - 23

• Study on botanical characteristics, chemical composition and acetylcholinesterase enzyme inhibitory effects of two species Piper thomsonii (C. DC.) Hook. f. var. thomsonii and Piper hymenophyllum Miq., Piperaceae family - 24
• Study on botanical characteristics, chemical composition and acetylcholinesterase enzyme inhibitory effects of two species Piper thomsonii (C. DC.) Hook. f. var. thomsonii and Piper hymenophyllum Miq., Piperaceae family - 21
• Study on botanical characteristics, chemical composition and acetylcholinesterase enzyme inhibitory effects of two species Piper thomsonii (C. DC.) Hook. f. var. thomsonii and Piper hymenophyllum Miq., Piperaceae family - 27
• Study on chemical composition, toxicity and some biological effects supporting the treatment of gastric and duodenal ulcers of Sanchezia nobilis Hook.F. leaves - 2
• Study on chemical composition and evaluation of anti-cancer effect of stem and leaves of Stephania dielsiana YC Wu - 1

HSQC spectrum of compound PT1 (156 mg) measured in CDCl 3

COSY-NMR spectrum of compound PT1 (156 mg) measured in CDCl 3

HR-FAB-MS [M] + spectrum of compound PT1 (156 mg)

APPENDIX 4.2

NMR AND MS SPECTRUM DATA OF COMPOUND PT2