hydrocinnamic aldehyde

Also hy·dro·cin·na·mal·de·hyde [hahy-droh-sin-uh-mal-duh-hahyd] /ˈhaɪ droʊˌsɪn əˈmæl dəˌhaɪd/.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018