Ctrl(Command)+Mshortcut is reserved for MRV copy. You can use this shortcut instead of
Ctrl(Command)+Caction for copying the selected structure.
How can I copy molecule names as text?
You can display texts in Marvin JS in text-boxes. Copy your text into clipboard, then open Marvin JS, select Text tool and left-click on the Canvas. Paste the molecule name into the opening Text dialog, then press OK button.