Zedoary Turmeric Oil (ZTO), a volatile oil, was extracted from the dry rhizome of Curcuma phacocaulis Valeton, Curcuma kwangsiensis or Curcuma phaeocaulis Valeton.

• 莪术油（Zedoary Turmeric oil）为莪术中提取的挥发油，莪术是姜科植物蓬莪术（Curcuma phacocaulis Valeton）、 广西莪术(Curcurma kwangsiensis ）和温郁金（Curcuma wenyujin）的干燥根茎。