[CH2:1]([C@H:5]1[C:17]2[NH:16][C:15]3[C:10](=[CH:11][CH:12]=[CH:13][CH:14]=3)[C:9]=2[CH2:8][C@H:7]([C:18]([O:20]C)=[O:19])[NH:6]1)[CH2:2][CH2:3][CH3:4].[OH-].[Na+]>CO>[CH2:1]([C@H:5]1[C:17]2[NH:16][C:15]3[C:10](=[CH:11][CH:12]=[CH:13][CH:14]=3)[C:9]=2[CH2:8][C@H:7]([C:18]([OH:20])=[O:19])[NH:6]1)[CH2:2][CH2:3][CH3:4]In the same manner as described in Reference Example 2-(1) using methyl (1RS,3SR)-trans-1-butyl-1,2,3,4-tetrahydro-β-carboline-3-carboxylate (2.0 g), 1N NaOH (8.2 ml) and methanol (35 ml), there is obtained the title compound (1.51 g, 79%) as colorless needles, m.p. 204°-205° C.
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