Please help me draw this molecule from the IUPAC name

May 2016
1
0
I'm supposed to draw a molecule using it's IUPAC name, which is 5-methyhept-3-ynoic acid.
Right now i have CH3 CH2 CH? CH2 CHCH3 CH2 CH3
don't know what to do about the ynoic acid part on the third carbon. what do I put there?

please help, this is due tomorrow and i'm really lost!
 
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