In this issue, H. Yang et al. review ultrasound-activated sensitizers and applications. What benefits does sonodynamic antitumor therapy offer? The Minireview by Y. Zhang et al. deals with conformational design principles in total synthesis. In an Essay, F. Würthner offers a historical perspective on aggregation-induced emission.

In the original research section, Y. Song et al. describe non-lithography hydrodynamic printing of micro/nanostructures of curved surfaces (see picture). W. L. Santos et al. succeeded in the organocatalytic trans phosphinoboration of internal alkynes. J. Zeng et al. found surface iron species in palladium–iron intermetallic nanocrystals to promote and stabilize CO₂ methanation. B. Kahr et al. established that crystals of benzamide, the first polymorphous molecular compound, are helicoidal.

• Angewandte Chemie 34/2020: Chemistry with A Twist,
  Angew. Chem. Int. Ed. 2020, 59 (34).