Is this what you mean?
D78, D79 Neo-Gruenfeld
1. d4 Nf6 2. c4 g6 3. g3 c6 4. Bg2 d5 5. Nf3 Bg7 6. O-O O-O
http://www.chessgames.com/perl/chess.pl?gamekey=Bg2Bg7Nf3Nf6c1c1c4c6d4d5g3g6/¬key=Bg2Bg7Nf3Nf6c1c1c4c6d4d5g3g6/b3&title=1.%20d4%20Nf6%202.%20c4%20g6%203.%20g3%20c6%204.%20Bg2%20d5%205.%20Nf3%20Bg7%206.%20O-O%20O-O%20&result=1-0
Does the opening complex for the gruenfeld where play play c6 before playing d5 have an eco code, name and listing here on chess.com? I could not find it.