Table 6.

Purity of the compounds

H2O/MeOH (20%/80%)
Compound	Retention time (Rt) in minutes	Purity
3a	1.90	99.99%
3b	1.90	99.99%
3c	1.98	97.59%
3d	1.88	99.99%
3e	1.86	99.61%
3f	1.92	90.71%
5a	1.75	99.97%
5b	1.76	99.95%
5c	1.76	99.91%
5d	1.76	99.90%
5e	1.75	99.75%
5f	1.76	99.95%
6a	1.74	99.95%
6b	1.75	99.95%
6c	1.75	99.94%
6d	1.75	99.77%
6e	1.78	99.54%
6f	1.74	97.79%
7ab	1.79	99.29%
7ac	1.82	98.93%
7ba	1.86	98.95%
7bb	1.86	98.88%
7bc	1.84	97.08%
7bd	1.85	97.23%
7bg	1.83	98.15%
7ec	1.84	98.01%
7fc	1.85	99.44%