Middleditch B S
J Chromatogr. 1976 Nov 3;126:581-9. doi: 10.1016/s0021-9673(01)84103-0.
The mass spectra of six tetrahydroisoquinolines and five tryptolines are surveyed. It is concluded that tryptolines are suitable for analysis of tryptamines, after condensation with aldehydes.