Jasmonic acid is derived from the fatty acid linolenic acid. It is a member of the jasmonate class of plant hormones.
The twin comforter was made for a twin bed which is 75 long with the idea that you get 10 extra length. If that is the perfect length for a standard twin bed, then for an 80. Twin XL bed you would want a comforter that is a true Twin XL which would be 90 long.
A standard twin mattress is 39 by 75 inches. A king is 76 by 80 inches. This means that a headboard for a king bed is going to be about 76 inches or wider, plenty wide enough to go along the length of a twin bed. Headboards are often slightly wider than the bed for which they are made.