Table 1.

Putative identification of metabolites in mature Mitragyna speciosa leaf.

Retention time (min)	m/z [M+H]+	Putative compound(s)	Elemental composition	Source
4.67	399.126	Caulerpin	C24H18N2O4	MetFrag
4.77	355.199	Yohimbine	C21H26N2O3	MetFrag
5.07	401.205	Isospeciofoline	C22H28N2O5	Avula et al. [11]
		Isorotundifoline	C22H28N2O5
5.14	385.210	Corynoxine	C22H28N2O4	Avula et al. [11]
		Corynoxine B
5.18	415.221	7-hydroxymitragynine	C23H30N2O5	Avula et al. [11]
		7β-hydroxy-7H-mitraciliatine	C23H30N2O5
5.43	397.211	Paynantheine	C23H28N2O4	Avula et al. [11]
		3-Isopaynantheine
9.09	399.268	Mitragynine	C23H30N2O4	Avula et al. [11]
		Speciogynine
		Speciociliatine
9.77	380.333	Mitragynaline	C21H20N2O5	Houghton et al. [12]
5.58	350.060	Corynantheidaline	C20H18N2O4	Houghton et al. [12]