Defining a constant string containing non printable character in C

I want to define a constant string containing non printable characters in C. For e.g - Let say I have a string

char str1[] ={0x01, 0x05, 0x0A, 0x15};

Now I want to define it like this

char *str2 = "<??>"

What should I write in place of <??> do define an string equivalent to str1?

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