"Qinan" is a word translated from Sanskrit. "Duojialuo" was often written in Buddhist scriptures in the Tang Dynasty, and later there were names such as Galand, Ganan and Qinan. Qinan is a sublimation and qualitative change of agarwood, but it needs extremely harsh special conditions. Qin 'an belongs to agarwood, but a piece of agarwood may not have Qin 'an. It is Daphne, agarwood or agarwood, and there is a lot of resin near the roots, which is sweet and warm. Qin 'an's fragrance is elegant and noble, which can only be felt by personal experience. Since the Han Dynasty, the royal family's worship to heaven, praying for blessings, worshipping Buddha, worshiping God, indoor incense and Qi Nan are all the most important incense materials. Among the Siku Quanshu, Zhancheng (now the kingdom of southern Vietnam) is the best and orthodox, but other countries that produce agarwood are also surprisingly fragrant.
See Baidu Encyclopedia for details.