Hex #157d5d or rgb(21,125,93) in RGB space is the tint of greenish cian. It has hue angle of 161.54 degrees, value = 49 and saturation = 83. #157d5d can be obtained by mixing 4 colors: 1 drop of red, 5 drops of blue, 1 drop of cyan, 5 drops of green.
Nearest safe hex - #006666. Below you can see the block with #157d5d color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #157d5d to the mixer and play with it.