Trinket+spell macro

[Garfunkel]

I don't have SuperMacro or anything like that, so it is possible to do a macro that pops a trinket and then immediately uses an ability or a spell or even both? Since I got Second Wind, I'd like a macro that couples that with Inner Focus. Even better if that can be combined with max rank Greater Heal on target. Or would that require me to spam the same button multiple times? Or is this impossible?

[rotten]

/script UseInventoryItem(13);
/cast Spellname

[Bottebo]

I tried the macro but doesn't work for me.
Here's a copy paste of the macro:
/script UseInventoryItem(13);
/cast Greater Heal(Rank 3)

it just says "another action is in progress'' and casts the heal without using the trinket first.
The trinket in question is Blessed Prayer Beads. It doesn't trigger GCD but has a castanimation, is that why?
I tried same macro but with a trinket that removes bleed and has no animation, with that it triggers the trinket and tries to cast the heal but interrupts the heal instantly.

[CodyMueller]

I tried the macro but doesn't work for me.
Here's a copy paste of the macro:
/script UseInventoryItem(13);
/cast Greater Heal(Rank 3)

take off the ; after 13)

[Bottebo]

I did it without the ; originaly. Same thing.