... 3.4206 Morphine and its analogues 8) Matsubara K, Fukushima S, Akane A et al. (1992) Increased urinary morphine, codeine and tetrahydropapavero-line in Parkinsonian patient undergoing L-3,4-dihydroxyphenylalanine ... conjugated forms of opiates, the authentic standards of mor-phine-3-glucuronide (M-3-G) and morphine-6-glucuronide (M-6-G) are necessary. In U.S .A. and Europe, it is easy to obtain these authentic ... Nakajima K, Igarashi K et al. (1992) Analysis of morphine-3-glucuronide in urine by LC/APCI-MS. Eisei Kagaku 38:121–126 (in Japanese with an English abstract) 14) Tatsuno M, Nishikawa M, Katagi...