2',4' dihydroxy 3' methoxychalcone 1 3,7 dimethoxy 5 hydroxyflavone 1 5 hydroxy 3,7,8 trimethoxyflavone 1 Elaeocarpaceae 1 Muntingia calabura 1 Muntingia calabura extract 1 Muntingia calabura extract fraction a 1 Muntingia calabura extract fraction b 1 Muntingia calabura extract fraction c 1 Muntingia calabura extract fraction d 1 Muntingia calabura extract fraction e Muntingia calabura extract fraction f 1 Muntingia calabura extract fraction g 1 acetic acid ethyl ester 1 acetylsalicylic acid 1 acute toxicity 1 analgesia 1 animal experiment 1 animal model 1 antinociception 1 antinociceptive agent 1 aqueous solution 1 article 1 calaburone 1 chalcone derivative 1 controlled study 1 dimethyl sulfoxide 1 drug identification 1 drug isolation 1 dry weight 1