How to bind a key in Evil Spacemacs when the leader key is comma?

Question

I have rebound "SPC m c" so it opens a file (from How to a create keybinding to open a particular file?):

(spacemacs/set-leader-keys "mc" (lambda () (interactive) (find-file "~/capture.org")))

And it opens the file as intended, because spacemacs/set-leader-keys is for binding with the leader key SPC.

Now I want to bind the same thing to ", c". How to bind a key when the leader key is comma?

I am using Emacs 25.2.1 with Evil Spacemacs on Linux.

UPDATE_1

I put this in ~/.spacemacs but then Emacs would say "Spacemacs encountered an error while loading your ~/.spacemacs file.":

(define-key evil-normal-state-map ",c" (lambda () (interactive) (find-file "~/capture.org")))

I put this in ~/.spacemacs but it had no effect (", c" opened agenda dispatcher as usual):

(with-eval-after-load 'evil-maps
  (define-key evil-normal-state-map ",c" (lambda () (interactive) (find-file "~/capture.org"))))

Answer 1

You can install evil-leader package and create your own leader apart from SPC. Or you can use

(define-key evil-normal-state-map (kbd ", m c") 'command)

ps: check the quotes, I am not sure about them

Answer 2

Assuming you have changed the SPC to , already. M-m is the other name for spacemacs/set-leader-keys

(define-key evil-normal-state-map (kbd "M-m c") (lambda () (interactive) 
(find-file "~/capture.org")))