Complex conjugate

Which Scheme implementations have a core procedure for computing the complex conjugate of a number?

System procedure obs
Bigloo
Biwa No complexes
Chibi
Chicken
Chez conjugate
Cyclone
Gambit conjugate
Gauche
Guile
Kawa
LIPS
Loko
MIT conjugate
Racket conjugate
Sagittarius
Scheme9 No complexes
STklos
Unsyntax

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