{'fraction_non_alphanumeric': 0.07433808553971487, 'fraction_numerical': 0.04684317718940937, 'mean_word_length': 4.28494623655914, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Conformational changes in cyclic (D-Phe-Pro-Gly-D-Ala-Pro) upon complexation with Mg++.

Upon long standing and very slow evaporation, a solution of the cyclic pentapeptide and Mg(SCN)2 in CDCl3/CD3CN produced colorless crystals of a 1:1 complex of the peptide and Mg++. X-ray diffraction analysis showed the contents of the asymmetric unit to be C24H31N5O5 X Mg++ X NCS- X HSO4- X 6H2O (P2(1)2(1)2(1), a = 8.444 (1) A, b = 10.735 (2) A, c = 39.726 (6) A). This first example of a metal ion complex with a cyclic pentapeptide is in the form of an infinite stack with alternating peptide and Mg++ moieties. The octahedrally coordinated Mg++ makes only two ligands with the peptide carbonyls: O(3)-Mg++ above and O(1)-Mg++ below. The equatorial coordinations involve three H2O molecules and NCS-. There is a profound change in conformation upon complexation, with several phi and psi values changing by 90 degrees to 230 degrees. One NCS- oxidizes to HSO4- to provide the counter-ion.