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. 2019 May 3;2019(21):3525–3533. doi: 10.1002/ejoc.201900221

Scheme 3.

Scheme 3

Proton and carbon numbering in host and guest compounds. For protons 27, 28, and 32 two different signals are present, but only for the CH232 protons, a distinction was made between the proton pointing upwards (32a) and the proton pointing downwards (32b).