For internal use
3D: *HNCO, *HNcaCO *HNCA, *HNcoCA *HNcaCB, *HNcocaCB *HAcaNH, *HAcacoNH 15N-NOESY 13C-NOESY 4D: 4D HCCH-TOCSY 4D HCcccoNH 4D CHNH-NOESY 4D CHCH-NOESY