$comment
SF-CIS
$end

$molecule
0 3
C
C   1 ccs
C   2 ccd        1 ccc
C   3 ccs        2 ccc         1 dihh
H   1 hc        2 hccs         3 dihc
H   2 hc        3 hccd         4 dihc
H   3 hc        4 hccs         1 dihc
H   4 hc        1 hccd         2 dihc

ccs         1.566000
ccd         1.343000
hc         1.074000
ccc         90.000
hccs        134.910
hccd        135.090
dihh         0.000
dihc        180.000

$end

$rem
JOBTYPE = sp
METHOD = HF
BASIS = CC-PVTZ
PURECART = 2222
SCF_CONVERGENCE = 9
THRESH = 12 
MAX_SCF_CYCLES = 100
MAX_CIS_CYCLES = 100
SPIN_FLIP = TRUE 
UNRESTRICTED = TRUE
CIS_N_ROOTS = 20 
CIS_SINGLETS = TRUE
RPA = FALSE
SCF_GUESS = CORE
$end