Lewis structure of tryptophan

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Step method to draw lewis structure of tryptophan

Step 1: Find valence e- for all atoms. Add them together.

C:4x11=44
H:1x12=12
N:2x5=10
O:2x6=12

Total=78

Step2: Find octet e- for each atom and add them together.

C:8x11==88
H:2x12=24
N=8x2=16    
O=8x2=16

Total=144

Step3: Gives you bonding e-. Subtract step 1 total from step 2

144-78=66e-

Step 4: Find number of bonds by diving the number in step 3 by 2(because each bond is made of 2 e-)

66e-/2= 33 bond pairs

Step 5: Find the number of nonbonding (lone pairs) e-. Subtract step 3 number from step 1.

78-66= 12e-=6 lone pair

This molecule is a complex molecule and there are multiple central atoms.You can not draw lewis structure unless you know the predetermined structure of tryptophan.

Lone pairs are in green. Bond pairs are in purple.

Tryptophan leewis structure