Verse

C (x32010@1)e-3/5/3-----------|
B-------5/3-------|
G------------4----|
D-----------------|
A-3---------------|
E-----------------|

e-----------------|
B-3/5/3-----------|
G-------4---------|
D-----------------|
A-----------------|
E-----------------|

Am (x02210@1)e-3/5/3-----------|
B-------5/3-------|
G------------4----|
D-----------------|
A-0---------------|
E-----------------|

e-----------------|
B-3/5/3-----------|
G-------4---------|
D-----------------|
A-----------------|
E-----------------|

Chorus (I'm not really sure about this part)

F (133211@1)       Dm (xx0231@1)e-3-3-3---5-5-5------|
B-3-3-3---6---6------|
G--------(7)-(7)-----| (I'm not 100% sure about this part!)
D--------------------|
A--------------------|
E--------------------|

The part where Ximena goes Hmm Hmmm Hmm Hmmm you can do this just for fun

e-----------------|
B-1-1/3-1/5-------|
G-----------------|
D-----------------|
A-----------------|
E-----------------|

Outro

C- (x32010@1)D- (xx0232@1)D#- (x43121@3)F (133211@1)e-3-5-6-8-11-10-11-13-11-10-8-10-6----|
B-------------------------------------|
G-------------------------------------| X 2
D-------------------------------------|
A-------------------------------------|
E-------------------------------------|

Then Omar plays C and Am really softly.
After that they play the Chorus and then the bass keeps playing C and A for a little bit.

http://omardigital.rodriguezlopezproductions.com/album/ciencia-de-los-inutiles
http://en.wikipedia.org/wiki/Omar_Rodr%C3%ADguez-L%C3%B3pez