| For S.4a | 0.35 g N-tert-butoxycarbonyl-(L)-serine methyl ester (S.3a) |
| For S.4b | 0.47 g N-tert-butoxycarbonyl-(L)-tyrosine methyl ester (S.3b) |
| For S.4c | 0.51 g N-tert-butoxycarbonyl-(L)-valine-(L)-serine methyl ester (S.3c) |
| For S.4d | 0.42 mg N-tert-butoxycarbonyl-(L)-valine ethylene glycol (S.3d) |
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