This looks quite like a ZX Spectrum palette.
Note: Color 6 is treated specially. Normally, color 6 would become dark yellow, but in order to achieve a more pleasing brown tone, special circuitry in most RGBI monitors makes an exception for color 6 and changes its hue from dark yellow to brown. Some monitors even provide a potentiometer labelled "BROWN ADJ." to adjust this color.
*EGA palette :