Pyrazolone, a five-membered-ring lactam, is a derivative of pyrazole that has an additional keto (=O) group. It has a molecular formula of C3H4N2O. There are three possible isomers: 3-pyrazolone, 4-pyrazolone, and 5-pyrazolone.
Examples of derivatives include:
Look at me now, we're on the town
Kicking up dust, it's all for us
City lights, pretty lights
Just take me out to play
Dressing me up is red for luck
So much to do to hide the blue
City lights, pretty lights
Just wear me out they say
Buttons and ribbons are finding their place
Smearing the make-up I put on my face
Spiders and lizards are tying my shoes
Whispering, da da da
Finding my crutch, a gentle touch
Finding my dance, retreat advance
City lights, pretty lights
Just ring me out to dry
Buttons and ribbons are finding their place
Smearing the make-up I put on my face
Spiders and lizards are tying my shoes