In the course of a screening for compounds inhibiting the growth of two human breast cancer cells lines, two highly cytotoxic compounds were isolated from fermentations of Myrothecium roridum. The elucidation of their structures revealed that they are macrocyclic trichothecenes of the verrucarin type, 16-hydroxyverrucarin A (1), reported here as a natural product for the first time, and verruca...

On-surface synthesis (OSS) involving relatively high energy barriers remains challenging due to a typical dilemma: firm molecular anchor is required prevent desorption upon the reaction, whereas sufficient lateral mobility crucial for subsequent coupling and assembly. By locking precursors on substrate then unlocking them during we present strategy address this challenge. High-yield based well-...

Deracemization describes the conversion of a racemic mixture chiral molecule into an enantioenriched or enantiopure compound without structural modifications. Herein, we report inherently perylene bisimide (PBI) cyclophane whose pocket is capable transforming [5]-helicene with enantiomeric excess 66 %. UV/Vis and fluorescence titration studies reveal this host composed two helically twisted PBI...

In the title compound, [Ni(C(9)H(7)O(2))(C(16)H(36)N(4))]ClO(4)·H(2)O, the macrocyclic 5,5,7,12,12,14-hexa-methyl-1,4,8,11-tetra-aza-cyclo-tetra-decane ligand (L) folds around the Ni(II) atom, which is also chelated by the carboxyl-ate group. The geometry is a distorted N(4)O(2) octa-hedron. In the crystal, adjacent mol-ecules are connected by O-H⋯O and N-H⋯O hydrogen bonds into a zigzag chain ...

The title compound, [CoCl(2)(C(15)H(24)N(6))(C(3)H(7)NO)], crystallizes as a monomeric complex. The coordination environment around the Co(II) center could be described as a distorted octa-hedron consisting of three N donors from the facially coordinating triaza macrocyclic ligand, one O donor from dimethyl-formamide and two Cl(-) ions. Neutral complex mol-ecules are associated via inter-molecu...

In the macrocyclic title compound, C(26)H(12)Cl(2)N(6)O(4), an O-atom-bridged calix[2]naphthalene-[2]triazine synthesized using a one-pot approach from naphthalene-2,7-diol and cyanuric chloride, the two isolated naphthalene planes and the two triazine-2,6-di-oxy planes adopt a 1,3-alternate configuration, with a dihedral angle of 84.10 (8)° between the naphthalene rings and a dihedral angle of...

Bioassay-guided fractionation of the organic extracts of a Bacillus amyloliquefaciens strain (AP183) led to the discovery of a new macrocyclic polyene antibiotic, bacillusin A (1). Its structure was assigned by interpretation of NMR and MS spectroscopic data as a novel macrodiolide composed of dimeric 4-hydroxy-2-methoxy-6-alkenylbenzoic acid lactones with conjugated pentaene-hexahydroxy polyke...

The complete cation in the title compound, [Cu(C(40)H(48)N(4))](ClO(4))(2), is generated by the operation of a crystallographic centre of inversion. The Cu(II) ion exists in a tetra-gonally distorted trans-N(4)O(2) coordination geometry defined by the four N atoms of the macrocyclic ligand and two weakly bound perchlorate-O atoms from two anions. The N-H atoms form intra-molecular N-H⋯O(perchlo...

The macrocyclic tetrapeptide natural product CJ-15,208 (cyclo[Phe-d-Pro-Phe-Trp]) exhibited both dose-dependent antinociception and kappa opioid receptor (KOR) antagonist activity after oral administration. CJ-15,208 antagonized a centrally administered KOR selective agonist, providing strong evidence it crosses the blood-brain barrier to reach KOR in the CNS. Orally administered CJ-15,208 also...

In the title compound, C(16)H(13)NO(5)S, the benzothia-zole unit is essentially planar [maximum deviation = 0.0501 (10) Å for the S atom] and is oriented at a dihedral angle of 67.85 (5)° with respect to the meth-oxy-substituted benzene ring. The mean plane of the meth-oxy group is oriented at 14.3 (3)° with respect to the benzene ring to which it is attached. In the crystal structure, weak C-H...