Excel formula

=IF(OR(L2="TTT",L2="TTC"),"Phe",IF(OR(L2="TTA",L2="TTG",L2="CTT",L2="CTC",L2="CTA",L2="CTG"),"Leu",IF(OR(L2="ATT",L2="ATC",L2="ATA"),"Ile",IF(OR(L2="ATG"),"Met",IF(OR(L2="GTT",L2="GTC",L2="GTA",L2="GTG"),"Val",IF(OR(L2="TCT",L2="TCC",L2="TCA",L2="TCG",L2="AGT",L2="AGC"),"Ser",IF(OR(L2="CCT",L2="CCC",L2="CCA",L2="CCG"),"Pro",IF(OR(L2="ACT",L2="ACC",L2="ACA",L2="ACG"),"Thr",IF(OR(L2="GCT",L2="GCC",L2="GCA",L2="GCG"),"Ala",IF(OR(L2="TAT",L2="TAC"),"Tyr",IF(OR(L2="TAA",L2="TAG",L2="TGA"),"STOP",IF(OR(L2="CAT",L2="CAC"),"His",IF(OR(L2="CAA",L2="CAG"),"Gln",IF(OR(L2="AAT",L2="AAC"),"Asn",IF(OR(L2="AAA",L2="AAG"),"Lys",IF(OR(L2="GAT",L2="GAC"),"Asp",IF(OR(L2="GAA",L2="GAG"),"Glu",IF(OR(L2="TGT",L2="TGC"),"Cys",IF(OR(L2="TGG"),"Trp",IF(OR(L2="CGT",L2="CGC",L2="CGA",L2="CGG",L2="AGA",L2="AGG"),"Arg",IF(OR(L2="GGT",L2="GGC",L2="GGA",L2="GGG"),"Gly","404 NO FOUND")))))))))))))))))))))  #You may need to change "L2" to where you want.