mine 2 yu members of this site is not much of a question though! iam just stack on woodward rules 4 diene absorption wavelengths specifically on heteroannular dienes. i ve seen a few instructions but cant b helped>>> pliz someone help me b 4 i flop>... questions are structural i ve failed 2 submit!!! 4 that am sooy the moderator>> i just ask 4 yo favour!!!!