I _think: LSHIFT(LALT(LGUI(Key_LeftControl))) or something close to that (I haven’t tested that for compilation.)
All of those LBLAH() things are C preprocessor macros that modify the thing inside them. But you’ve got nothing inside to modify.
https://github.com/keyboardio/Kaleidoscope/blob/master/src/key_defs.h#L78 should help explain it if you have a little bit of C experience.