Goniothalamus/chemistry; Lactones/pharmacology; Plant Extracts/pharmacology; Platelet Aggregation Inhibitors/pharmacology; Platelet Membrane Glycoproteins/antagonists & inhibitors; Receptors, G-Protein-Coupled/antagonists & inhibitors; Animals; Blood Platelets/drug effects; Blood Platelets/metabolism; Dose-Response Relationship, Drug; Furans/chemistry; Furans/isolation & purification; Furans/pharmacology; Inhibitory Concentration 50; Lactones/chemistry; Lactones/isolation & purification; Naphthalenes/chemistry; Naphthalenes/isolation & purification; Naphthalenes/pharmacology; Plant Bark/chemistry; Plant Extracts/chemistry; Plant Extracts/isolation & purification; Platelet Aggregation/drug effects; Platelet Aggregation Inhibitors/chemistry; Platelet Aggregation Inhibitors/isolation & purification; Platelet Membrane Glycoproteins/chemistry; Platelet Membrane Glycoproteins/drug effects; Platelet Membrane Glycoproteins/isolation & purification; Protein Binding/drug effects; Pyrones/chemistry; Pyrones/isolation & purification; Pyrones/pharmacology; Rabbits; Receptors, G-Protein-Coupled/chemistry; Receptors, G-Protein-Coupled/drug effects; Receptors, G-Protein-Coupled/isolation & purification